6T70 6L80

Course Number 17440.13D

Transmissions: New & Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70 Service Technical College

Participant Guide

Revised 09/17/08

Caution In order to reduce the risk of personal injury or property damage, carefully observe the following information: The service manuals of General Motors Corporation are intended for use by professional, qualified technicians. Attempting service procedures without the appropriate training, tools, and equipment could cause personal injury, vehicle damage, or improper vehicle operation. Proper vehicle service is important to the safety of the service technician and to the safe, reliable operation of all motor vehicles. If a replacement part is needed, use the same part number or an equivalent part. Do not use a replacement part of lesser quality. The service manuals contain effective methods for performing service procedures. Some of the procedures require the use of tools that are designed for specific purposes. Accordingly, any person who intends to use a replacement part, a service procedure, or a tool that is not recommended by General Motors, must first establish that there is no jeopardy to personal safety or the safe operation of the vehicle. The service manuals contain Cautions and Notices that must be observed carefully in order to reduce the risk of personal injury. Improper service may cause vehicle damage or render the vehicle unsafe. The Cautions and Notices are not all-inclusive. General Motors can not possibly warn of all the potentially hazardous consequences that may result by not following the proper service procedures. The service manuals cover service procedures for vehicles that are equipped with Supplemental Inflatable Restraints (SIR). Failure to observe all SIR Cautions and Notices could cause air bag deployment, personal injury, or otherwise unneeded SIR repairs. Refer to the SIR component and wiring location views in Restraints before performing a service on or around SIR components or wiring. If multiple vehicle systems are in need of repair, including SIR, repair the SIR system first to reduce the risk of accidental air bag deployment and personal injury. January 2002

Table of Contents Introduction......................................................................................................................................................................... i-1 Module 1: 6T70/6T75 Automatic Transmissions.......................................................................................................1-1 Module 2: 6L50/ 6L80/6L90 Automatic Transmissions, Part 1 ...............................................................................2-1 Module 3: 6L50/ 6L80/6L90 Automatic Transmissions, Part 2 ...............................................................................3-1 Module 4: 4L60/4L65/4L70 Automatic Transmissions ..............................................................................................4-1 Evaluation Instructions ................................................................................................................................................... E-1

Instructor Name: This manual contains information about service for the 6T70/6T75, 6L50/6L80/6L90, and 4L60/4L65/4L70 automatic transmissions. Always refer to applicable vehicle service information and appropriate Dealer Technical Service Bulletins for additional information regarding system operation and diagnostic/repair procedures. When this manual refers to a brand name, a number, or a specific tool, you may use an equivalent product in place of the recommended item. All information, illustrations and specifications in this manual are based on the latest product information available at the time of publication approval. General Motors reserves the right to make changes at any time without notice. No part of this book may be reproduced, stored in any retrieval system, or transmitted in any form or by any means (including but not limited to electronic, mechanical, photocopying, and recording) without prior written permission of General Motors Corporation. This applies to all text, illustrations, tables and charts.

© 2008

Transmissions: New & Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70 Introduction

Introduction

i-1

Welcome

Course Goal

Welcome to the Transmissions: New & Updates Interactive Distance Learning (IDL) for the 6T70/6T75, 6L50/6L80/6L90, and 4L60/4L65/4L70 automatic transmissions.

Upon successful completion of this course, you will be able to apply concepts and procedures to diagnose and repair the Hydramatic automatic transmission for the 6T70/75, 6L50/80/90 and 4L60/65/70.

• •

Completion of prerequisites is recommended. Refer to www.gmtraining.com for prerequisites.

OneTouch Familiarization • • • •

Press the red call button to ask a question. Wait for a green light before speaking. Anticipate a momentary delay when speaking. Contact the Technical help desk at 1-888-748-2687, prompt 1, if necessary.

Session Objectives

Question 1

2008 and 2009 4L60/4L65/4L70 automatic transmissions

Describe product updates and procedures for the: 6T70/6T75 automatic transmission 6L50/6L80/6L90 automatic transmissions

In which of the following regions is your dealership located? A. Atlanta `

B. Chicago

Strategy Based Diagnostics

C. Dallas D. Los Angeles E. New York

Special Instructions The diagnostic charts in this courseware are for reference only. Refer to Service Information when servicing the 6T70/6T75, 6L50/6L80/6L90 and 4L60/4L65/4L70 automatic transmissions or their components.

Participant Guide

Step 1. Understand & verify customer’s concern Step 2. Check that vehicle is operating as designed Step 3. Conduct Preliminary Checks-visual and operational Step 4. Perform Diagnostic System CheckVehicle Step 5. Check Bulletins, Recalls and Preliminary Information Step 6. Perform Diagnostics Step 7. Re-examine the Concern Step 8. Repair and Verify Fix

© 2008 General Motors Corporation All Rights Reserved

Revised 09/17/08

i-2

Transmissions: New & Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70

STC Training Courses* Video

WBT

1−Component Course 2−Component Course

IDL

Hands-On

X X

3−Component Course

X X

X

X

* Sample course component combinations

*Course Components •

A 1-component course has no prerequisite or follow-up component.

•

A 2-component course has a recommended prerequisite WBT or Video component which you should complete before attending the IDL; (or) it consists of an IDL or WBT followed by a Hands-On component which you will need to take in order to complete the course.

•

A 3-component course has a recommended prerequisite WBT or Video component which should be completed before attending the IDL. You will need to take the follow-up Hands-On component in order to complete the entire course.

The dealership STS Report is credited when all components of the course are completed.

NOTICE: You will see your Training Record and Individual Training Plan change after each course component is successfully completed. Just visit www.gmtraining.com and check TMS.

To purchase authentic GM Service Training Materials, contact the GM Training Materials Headquarters at 800-393-4831.

Participant Guide


Revised 09/17/08

Transmissions: New & Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70 Module 1 6T70/6T75 Automatic Transmissions

6T70/6T75 Automatic Transmissions

1-1

9 Bolt Support Assembly

Module 1 Objective Describe product updates and procedures for the 6T70 and 6T75 automatic transmission

All-Wheel Drive Differential Assembly

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2-Wheel Drive • •

•

All-Wheel Drive

The AWD differential is serviced only as an assembly. It will have an all new torque converter housing, differential, and case for AWD vehicles. The AWD differential splines directly to the transfer case to drive the propeller shaft.

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•

•

Participant Guide

The 9-bolt support assembly eliminates one bolt for mass reduction. Hardware changes relate to all 6T70 torque converter housings. − The bolt hole in the support remains on early production 2007 models. − The torque converter housing boss is not drilled or tapped. The 9 bolt torque converter housings will service all models. The assembly can be used on the 2007 and early 2008 support that was originally 10 bolts, using the 9 bolt torque sequence. The support is serviced as an assembly. The gear and bearing is NOT serviced separately. Refer to Service Information for detailed instructions and current information.


Revised 09/17/08

1-2


Cooler Lines—Line Snout •

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Long Snout

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The Transmission Oil Cooler lines have a longer snout line and deeper holes in the case to reduce leaking. The case was modified to accept a longer snout line. Early 2007 transmission cases will NOT accept the new cooler line. The new cooler line will go into vehicle production as the previous design stock is depleted. Implementation began late first quarter 2008.

The short snout cooler line can be used in the case with the deeper hole.

Short Snout

Participant Guide


Revised 09/17/08


1-3

One Bolt Lube Trough • •

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Participant Guide

One lube trough bolt has been eliminated. The new one bolt trough was introduced in early 2008.

The two-bolt trough was being used in production with only one bolt retaining the trough. Hardware changes include: − Case casting − Lube trough A one bolt trough will back service a two bolt trough. One bolt hole in the case and one bolt was eliminated in October 2007.


Revised 09/17/08

1-4


Input & Output Sun Gear For the Output Carrier Assembly: • •

•

The bearing thickness has been increased for improved durability. The bearing pocket machining is 0.3 millimeter (0.01 inch) deeper to accept the new output sun gear thrust bearing thickness. The new Output Carrier Assembly will service all previous 2007 and 2008 models without any impact. The bearing is captured inside the carrier.

For the Reaction Carrier Assembly: • •

How many bolts are used to retain the new 6T70 Support Assembly?

IMPORTANT: The new Reaction Carrier Assembly will service all previous 2007 and 2008 models if used together with the new Input Sun Gear Thrust Bearing.

Participant Guide

The bearing pocket machining is 0.25 millimeter (0.009 inch) deeper. This new depth accepts the new reaction carrier sun gear thrust bearing thickness.

_______________________________ _______________________________ _______________________________


Revised 09/17/08


1-5

Support Seal Staking Procedure •

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•

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This procedure was added to improve the retention of the Front Differential Transfer Drive Gear Support Seal to the Support Assembly. The DT-49131 Seal Staking tool is used to stake the seal into the support assembly. It should be used on all 6T70 model year transmissions. The stake does not need to be deep. It should distort the metal a slight amount. − Compare the new stake marks to the production staking marks on the support. The production staking marks can be cleaned up using emery cloth or equivalent prior to installing the new seal.

TECH TIP When staking the support seal, do NOT stake the seal near the 3 lube holes—or a restriction could occur.

J 46627-A Seal Installer •

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• •

Participant Guide

If the Seal Installer tool is not available at your dealership, set the seal below the surface slightly, but do not seat the seal. The tool is designed to install the seal slightly below the surface, but not down far enough to completely seat it. If the seal is installed too deep into its bore, it could deform the seal. If this happens, fluid pressure will push the seal out of the bore, causing a catastrophic transmission failure.


Revised 09/17/08

1-6


Inspection Procedure for 6T70 Upper Channel Plate Damage •

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•

•

Inspect the upper channel plate bolt pass through holes for damage or burnelling whenever the Control Valve Assembly is removed from the Valve Body Assembly. Any damage near the pressure control solenoid (PCS) feed hole could cause leaking around the PCS switch seal. Replace as necessary. Inspect the pressure switch manifold seals for damage. Replace the control valve assembly as necessary. NOTE: This also applies to the 6T40 transmission.

TECH TIP To assist the Brand Quality Managers in reducing unnecessary valve body replacement, valve body reconditioning is required whenever the transmission is being repaired.

Participant Guide


Revised 09/17/08


1-7

HYDRA-MATIC Front Wheel Drive 6T70 (MH2), 6T75 (MY9) and All Wheel Drive 6T70 Automatic Transmission Control Valve Body Assembly Models:

2008 Buick Enclave 2008 Chevrolet Equinox, Malibu 2007-2008 GMC Acadia 2007-2008 Pontiac G6 2008 Pontiac Torrent 2007-2008 Saturn AURA, OUTLOOK 2008 Saturn VUE with 6T70, 6T75 HYDRA-MATIC® Front Wheel Drive Automatic Transmission (RPOs MH2, MY9) or 6T70, 6T75 HYDRA-MATIC® All Wheel Drive Automatic Transmission (RPOs MH4, MH6) This bulletin is being updated to add the control valve body upper and lower spacer plate assembly. Please discard Corporate Bulletin Number 08-07-30-005 (Section 07—Transmission/Transaxle. Caution: Valve springs can be tightly compressed. Use care when removing retainers and plugs. Personal injury could result. Notice: After cleaning the transmission components, allow to air dry. Do not use cloth or paper towels in order to dry any transmission components. Lint from the towels can cause component failure. Notice: Do not reuse cleaning solvents. Previously used solvents may deposit sediment which may damage the component.

TECH TIP Valve body reconditioning is REQUIRED whenever a transmission is being repaired. Labor time is included in the transmission reconditioning labor time.

TECH TIP Approximately 75 percent of all valve body replacements have a No Trouble Found code when analyzed by Engineering.

Reconditioning consists of removing the valve line-ups, and cleaning and inspecting the valves, springs and valve body bores.

Participant Guide


Revised 09/17/08

1-8


6T70 Upper Control Valve Body Assembly—Left Side (Fill-in-theblanks) Fill in the blanks Call Out Number 325

Description Low and Reverse and 4-5-6 Clutch Regulator Valve Spring Low and Reverse and 4-5-6 Clutch Regulator Valve

327

Bore Plug

328

Retainer

329

Torque Converter Clutch Regulator Apply Valve Spring Torque Converter Clutch Regulator Apply Valve Torque Converter Clutch Regulator Apply Shuttle Valve

332

2-6 Clutch Regulator Valve Spring 2-6 Clutch Regulator Valve 2-6 Clutch Regulator Valve Gain Valve

335

3-5 Reverse Clutch Regulator Valve Spring 3-5 Reverse Clutch Regulator Valve

Participant Guide


Revised 09/17/08


1-9

6T70 Upper Control Valve Body Assembly—Right Side (Fill-in-theblanks) Fill in the blanks Call Out Number

Description

327

Bore Plug Pressure Regulator Valve

338

Pressure Regulator Valve Spring

339

Retainer Isolator Valve

341

Isolator Valve Spring Torque Converter Clutch Control Valve

343

Torque Converter Clutch Control Valve Spring

344

Clutch Select Solenoid Valve #3 Spring Clutch Select Solenoid Valve #3

346

Clutch Select Solenoid Valve #2 Spring Clutch Select Solenoid Valve #2 Manual Valve

Participant Guide


Revised 09/17/08

1-10


6T70 Lower Control Valve Body Assembly—Left Side (Fill-in-theblanks) Fill in the Blanks Call Out Number

Description

339

Retainer 4-5-6 Clutch Boost Valve

361

4-5-6 Clutch Boost Valve Spring Actuator Feed Limit Valve

363

Actuator Feed Limit Valve Spring 3-5 Reverse Clutch Boost Valve

365

Participant Guide


3-5 Reverse Clutch Boost Valve Spring

Revised 09/17/08


1-11

6T70 Lower Control Valve Body Assembly—Right Side (Fill-in-theblanks) Fill in the Blanks Call Out Number

Description

327

Bore Plug

339

Retainer 4-5-6 Clutch Accumulator Piston

367

4-5-6 Clutch Accumulator Piston Spring

368

4-5-6 Clutch Accumulator Piston Retainer 1-2-3-4 Clutch Boost Valve

370

1-2-3-4 Clutch Boost Valve Spring

371

1-2-3-4 Clutch Regulator Valve Spring 1-2-3-4 Clutch Regulator Valve Default Override 1-2-3-4 Clutch Valve

Participant Guide


Revised 09/17/08

1-12


6T70 Lower Control Valve Body Assembly—Right Side (Fill-in-theblanks) Fill in the Blanks Call Out Number

Description Control Valve Channel Upper Plate Assembly

302

Control Valve Body Bolt

303

Control Valve Body Bolt Control Valve Channel Plate

305

Control Valve Body Bolt

306

Actuator Feed Accumulator Piston

307

Actuator Feed Accumulator Spring

308

Control Valve Body Locator Pin Control Valve Upper Body Spacer Plate Assembly

310

Control Valve Body Spacer Plate Retainer

311

Control Valve Body Ball Check Valve Control Valve Upper Body Assembly

313

Control Valve Lower Body Spacer Plate Assembly Control Valve Lower Body

Participant Guide


Revised 09/17/08


1-13

6T70 Control Valve Body Spring, Bolt, Bore Plug & Retainer Identification—Metric

TECH TIP Refer to Service Information for current information and procedures for any component or part you are servicing.

Participant Guide


Revised 09/17/08

Transmissions: New & Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70 Module 2 6L50/6L80/6L90 Automatic Transmissions, Part 1

6L80

6L50

6L90

6L50/6L80/6L90 Automatic Transmissions, Part 1

2-1

Module 2 Objective Describe product updates and procedures for the 6L50, 6L80 & 6L90 automatic transmissions

6L50 3-5-R Clutch Piston Capacity Reduction & Volume Reduction

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• • •

•

Spacer Plate Assembly

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This update addresses the 3-5-R draindown issue and Neutral to Drive delay by decreasing the piston volume. Reduction in the capacity and calibration update will result in a quicker apply. The change also affects the 1-2-3-4 clutch piston housing and piston. The part number for the 3-5-R piston assembly has changed, which resulted in a clutch capacity reduction of 20 percent. Related hardware changes: − 1-2-3-4 clutch piston and housing − Calibration

Multiple spacer plate changes for all models affect all variants. The change was initiated to prevent occurrences of field DTC P0751.

TECH TIP Review to Technical Service Bulletins for correct information for the model you are servicing. Refer to Service Information for correct procedures for all components being serviced.

Participant Guide


Revised 09/17/08

2-2

Transmissions: New and Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70

Technical Service Bulletin—DTC P0751 diagnostics NOTE: Procedures are different based on vehicle. Malfunction Indicator Lamp (MIL) On - Check Engine Light, DTC P0751 (Diagnose and Repair as Necessary) (Jan 17, 2008) Models

2007-2008 GMC Sierra with 6L90 (RPO MYD) Automatic Transmission 2006 Cadillac STS-V, XLR-V 2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT, SRX, STS, STS-V, XLR, XLR-V 2008 Cadillac CTS 2006-2008 Chevrolet Corvette 2008 Chevrolet Suburban 2007-2008 GMC Sierra Denali, Yukon Denali, Yukon Denali XL 2008 GMC Yukon XL 2008 HUMMER H2 with 6L50 (RPO MYB), 6L80 (RPO MYC) or 6L90 (RPO MYD) Automatic Transmission

Condition Some customers may comment on a malfunction indicator lamp (MIL) being illuminated. A scan tool may reveal DTC P0751 set in the TCM as current or in history. 2007 Silverado or Sierra with 6L90 Transmission (MYD) 3. Disassemble the valve body to: • • • • • •

•

Inspect transmission filter for any cracks, holes or split seams that may allow air to be sucked into the pump. Inspect the check balls for roundness ensuring that there are no flat spots. Measure all the valve body bore plugs (328) for diameter. The specification is 11.502 mm +/0.004 mm. Undersize bore plugs should be replaced. Inspect clutch select valve 2 (352) (Closest to the manual valve) in the lower valve body (351) for freedom of movement and travel. Inspect CBR1/C456 Reg Valve (327) in the upper valve body (321) for freedom of movement and travel. Perform Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test (SI Document ID #1618572) to determine if shift solenoid #1 is functioning properly. Important: The seals included in plate kit, P/N 24236934, should be replaced when the valve body is assembled. Do not reuse the old seals. Replace the spacer plate.

Important: 2008 Silverado or Sierra equipped with 6L90 (MYD) are built with this TCM calibration revision. 4. Reprogram the transmission control module TCM) with updated calibration files using the TIS2WEB Service Programming System (SPS) application. This new service calibration was released with TIS satellite data update version 7.5 or later, available July 22, 2007. As always, make sure your Tech 2® is updated with the latest software version.

Participant Guide


Revised 09/17/08


2-3

Technical Service Bulletin—DTC P0751 diagnostics cont. Part Number

Description

24245720 (2007-08 MYD) (2008 MYB, MYC)

Plate, Control Valve Spacer

24246916 (2006-2007 MYC)


24246917 (2007 MYB)


24236934 (MYC, MYD)

Plate Kit, Control Solenoid Valve Filter

24238925 (MYB)

Plate Kit, Control Solenoid Valve Filter

Refer to Service Information for current descriptions and part numbers.

Low Clutch Sprag Assembly •

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•

•

Design changes include removing the groove from the inner race, changing oil hole localization tolerance, and material change. The new part number of Low Clutch Sprag Assembly has changed. The new sprag assembly is fully backserviceable and interchangeable with the old design. There is no change to the fit, form, or function of the assembly.

Tools for servicing the Low and Reverse Clutch Assembly: − DT-49122 Clutch Spring Adapter for the 6L50 − DT-47779 Clutch Spring Compressor for the 6L80 and 6L90 − DT-49743 Clutch Spring Adapter The Clutch Spring Adapter tool is currently in development for the 6L80/90 transmission.

IMPORTANT: Use these tools to prevent damage to the sprag retainers.

Participant Guide


Revised 09/17/08

2-4


Clutch Backing Plate Retaining Ring Specifications (6L50) Clutch Pack Travel Specification—1.65-2.33 mm (0.065-0.092 in) Retaining Ring Thickness Metric

O.D. Color

English

Important: After measuring clutch pack travel, determine if the measurement is within the specification. If the measurement is not within the specification, measure the thickness of the existing retaining ring, and then choose a thicker or thinner retaining ring that will bring the measurement within specification.

•

•

• •

•

1.98-2.08 mm

0.078-0.082 in

Orange

2.28-2.38 mm

0.090-0.094 in

Yellow Stripe

2.58-2.68 mm

0.102-0.106 in

Light Blue Stripe

2.88-2.98 mm

0.113-0.117 in

Purple Stripe

3.18-3.28 mm

0.125-0.129 in

Green

Release 5 snap rings each for Low/Reverse and for 2-6 Clutch assemblies improve the assembly process and meet travel weight specifications. The center support assembly for the Low/Reverse groove has moved. A new coordinated backing plate must be used with new snap rings. Prior to the break point, a kit must be used, which includes all selectives. The DT 47868-4 Clutch Travel Weight Adapter tool was developed to measure Low/Reverse and 2-6 clutch travel. A new Clutch Travel Specification Table can be found in Service Information.

Participant Guide

What is the result of the 3-5-R Clutch Piston Assembly change? ______________________________ ______________________________ ______________________________


Revised 09/17/08


2-5

Transmission Case Extension for AWD “Nodal” Mount •

•

• • Transmission case extension

•

The new case extension with provisions accommodates the AWD “nodal” crossmember and mounting system for global luxury rear wheel drive vehicles platform. The new extension is back-serviceable and interchangeable with the old extension for 2007-2009 AWD applications. The part was released for service in 2008. The part number for the extension case has changed to accommodate the nodal mount system for the 2010 model year. The new extension must be used with AWD vehicles requiring nodal mounting system.

Nodal mount

Participant Guide


Revised 09/17/08

2-6


6L50 Case Modifications •

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• •

Participant Guide

To reduce mass, the 6L50 case has been modified to accommodate the 2010 Chevrolet Impala, Pontiac Solstice and Saturn SKY programs. Changes include removal of two upper handling bosses. These are the bosses that are used to attach the service holding fixture. The part number for the case assembly has changed. The new DT 48989 Holding Fixture tool has been developed for the 6L50, 6L80 and 6L90 transmissions. The tool accommodates gradual tooling changes from case suppliers.


Revised 09/17/08


2-7

Changes to Longitudinal 6 speed Transmission 6L80 3-5-R Clutch Piston Capacity Reduction & Stationary Volume Reduction

3-5-R Clutch Plate Assembly

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•

• •

•

This change was a calibration request to reduce 3-5-R clutch capacity area by 20 percent. A decrease in piston volume addresses the issue of Neutral/Drive delay. Part number changes:: − 3-5-R piston assembly − 1-2-3-4 clutch piston housing − 3-5-R clutch spring − Spacer plate − 1-2-3-4 piston − 3-5-R clutch piston inner seal (seal is only available with the seal kit) The old piston and related parts are to be maintained for 2006 and 2007 model years. First and second design seal kits were created and updated.

Participant Guide

•

•

Clutch plate material changed to an updated clutch plate to reduce wear. The part number of the plate assembly has changed. The new plate design is back-serviceable.


Revised 09/17/08

2-8


Park Pawl Actuator Guide Assembly

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Manual Shaft Detent Lever Hub Pin

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Low/Reverse Snap Ring Selectivity

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Participant Guide

This change is a supplier request to revise tolerance and Geometric Dimensioning and Tolerancing (GD&T) to increase production volume. This affects 6L50, 6L80 and 6L90. − The part numbers are changed to track tolerance updates. − For the 6L50, 6L80 and 6L90, the part number of the park pawl actuator guide assembly has changed. The new park pawl actuator guide is backserviceable. The change will be transparent to the technician. There is no difference to fit or function. Existing stock will be used before implementing new stock. This increases the taper end by 2.5 millimeters (approximately 0.09 inch) on both ends, a total length change of 5 millimeters (0.19 inch). The change affects 6L50, 6L80 and 6L90. The part number of the hub pin has changed. The new manual shaft detent lever hub pin is back-serviceable. Existing stock will be used before implementing new stock.

Three snap rings are available for Low/Reverse clutch assembly which improves the assembly process while maintaining current travel specifications. The current part number for the Retaining Ring remains (this is the nominal ring). Two additional snap rings have been added—one thicker, and one thinner. The new snap rings are back-serviceable.


Revised 09/17/08


2-9

Low/Reverse Clutch Backing Plate Retaining Measurement •

•

Install the DT-47868-1 Pack Travel Weight and the DT-47868-4 Travel Weight Adapter onto the low and reverse clutch backing plate. Attach the J 8001 Dial Indicator Set to the J 26900-13 Magnetic Base, and then zero out the dial indicator on the Pack Travel Weight.

Chamferless Hubs •

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The chamfer from the leading edge of the 6L80 and 6L90 1-2-3-4 Clutch Hub Assembly and the 2-6 and 3-5-R Reverse Clutch Hub Assembly has been removed. The part numbers for the 1-2-3-4 Hub Assembly 2-6 and the 3-5-R Hub Assembly have changed. New hubs are interchangeable with the old design.

4-5-6 Housing Assembly • •

•

Participant Guide

The manufacturing process was changed. The part number for both the 6L80 and the 6L90 4-5-6 Housing Assembly has changed. A new housing assembly is interchangeable with the old design.


Revised 09/17/08

2-10


Park Pawl Actuator Rod • •

•

•

The strength of the rod is changed to improve durability. Several field returns for No Park condition–bent rods—all failures confirmed to be customer abuse (high speed engagement). The part number for the 6L50, 6L80 and 6L90 Park Pawl Actuator Assembly has changed. New rods are interchangeable with the old material design and are back-serviceable.

Valve Bore Plug • • •

Important: Do not use old seal rings. Install NEW seal rings. Reusing old seal rings may cause internal transmission leaks and transmission damage.

Participant Guide

The valve body bore plug material was changed to no lead. The part number for the valve bore plug has changed. The new material bore plugs are interchangeable with old material plugs.

TECH TIP Some models have seal rings with installation identification marks that consist of approximately 11 evenly-spaced injection molding gate trim rings and/or a white stripe printed on one side. This installation orientation must be observed to avoid fluid leakage which may cause shift concerns. Models utilizing an inner O-ring seal have accompanying outer seal rings that contain anti-rotation tabs and can only be installed one way.


Revised 09/17/08


2-11

Pump Cover 1-2-3-4 & 3-5-R Fluid Seal Ring and New Quad Seal Procedure: • •

Conditions for Leaking Fluid Seal Rings The fluid seal rings may be leaking if: • Delayed/extended or delayed with harsh feel initial Park to Drive and/or Reverse to Drive shifts, that are more likely to occur when the transmission temperature is below approximately 40°C (104°F). • Harsh or flaring 2-3 shifts that are more likely to occur when the transmission fluid temperature is in the approximately 0°C (32°F) to 40°C (104°F) temperature range, but can be present at any temperature. • Harsh 2-3 shifts that are more likely to occur at less than 50 percent throttle position. • NOTE: Vehicles built January through August 2007 are more likely to have leaking fluid seal rings.

Be sure to follow this diagnostic or repair process thoroughly and complete each step.

Participant Guide

Install the first seal ring with the identification marks facing up. Then install the remaining two seal rings with the identification marks facing down.

Important: When inspecting the 1-2-3-4 and 3-5-R clutch fluid seal rings (230) there probably will not be visible signs that the seal rings are damaged. If any of the conditions above describe the flare/harsh 2-3 shift condition, replace the 1-23-4 and 3-5-R clutch fluid seal rings. DO NOT replace the valve body or Transmission Control Module.

TECH TIP The 1-2-3-4 and 3-5-R clutch fluid seal rings must be properly oriented when they are installed. Incorrect installation could lead to fluid leakage and shift concerns. Refer to Service Information for installation directions. •

If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.


Revised 09/17/08

Transmissions: New & Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70 Module 3 6L50/6L80/6L90 Automatic Transmissions, Part 2

6L80

6L50

6L90

6L50/6L80/6L90 Automatic Transmission, Part 2

3-1

Module 3 Objective Describe reconditioning procedure for the Control Valve Body Assembly for the 6L50, 6L80 and 6L90 automatic transmissions

TECH TIP In an effort to assist the Brand Quality Managers in reducing unnecessary valve body replacement, valve body reconditioning is required whenever the transmission is being repaired.

Notes: ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________

TECH TIP

___________________________________

Approximately 75 percent of all valve body replacements have a No Trouble Found code when analyzed by Engineering.

Participant Guide

___________________________________ ___________________________________ ___________________________________


Revised 09/17/08

3-2


Control Valve Body Assembly Reconditioning Procedure 2007-2008 GMC Sierra, Denali, Yukon Denali, Yukon XL Denali 2008 GMC Yukon XL 2008 HUMMER H2 with 6L50, 6L80 or 6L90 HYDRA-MATIC® Rear Wheel Drive Automatic Transmission (RPOs MYB, MYC, MYD). The information outlined in this bulletin is designed to provide easy to follow control valve body reconditioning instructions using the new illustrations to simplify reassembly of the 6L50, 6L80 and/or 6L90 automatic transmission control valve body assembly. Caution: Valve springs can be tightly compressed. Use care when removing retainers and plugs. Personal injury could result. Notice: After cleaning the transmission components, allow to air dry. Do not use cloth or paper towels in order to dry any transmission components. Lint from the towels can cause component failure. Notice: Do not reuse cleaning solvents. Previously used solvents may deposit sediment, which may damage the component.

Participant Guide


Revised 09/17/08


3-3

Control Valve Body Assembly Reconditioning Procedure cont. Inspection Procedure 1. Using the disassembled view, inspect each bore for freedom of valve(s) movement and evidence of debris. Pay particular attention to those valves related to the customer’s concern. 2. Verify movement of the valves in their normal installed position. Valves may become restricted during removal or installation. This is normal due to small tolerances between the valves and bores. 3. If a valve is restricted and cannot be corrected by cleaning the valve and bore, replace the valve body. Describe the restricted valve on the repair order. Disassembly/Reassembly for Cleaning Debris 1. If a valve is restricted by a metal burr from machining that bore, remove the valve and burr. Inspect the movement in the valve’s normal position. If no other debris or restrictions are found, reassemble the valve body and install in the transmission. 2. If the valve body has been contaminated with debris from another transmission component failure, disassemble all bores for complete cleaning of all valve body components. Keeping individual bore parts separated will make reassembly easier. Use the following illustrations for positive identification and location of individual parts. 3. Using GM Brake Clean, or equivalent, in a safe and clean environment (clean aluminum pan), clean the valve body and dry it with compressed air. Use appropriate eye protection. 4. Clean individual valve body components with GM Brake Clean, or equivalent. Coat each valve with clean ATF and reassemble in each bore. Check each valve for free movement during assembly of each bore. Important: Position the valve body as shown in the following illustrations for positive identification and location of individual parts.

REMINDER: Movement of the valves in the Valve Body should be verified in their normal installed position.

Participant Guide


Revised 09/17/08

3-4


6L50 Upper Control Valve Body Assembly Left Side Fill in the Blanks Call Out Number

Description

323

Retainer

326

Clutch Regulator Valve Spring

328

Bore Plug Clutch Boost Valve

330

Clutch Boost Valve Spring 3-5 Reverse Clutch Regulator Valve 1-2-3-4 Clutch Regulator Valve Shuttle Valve

Participant Guide


Revised 09/17/08


3-5

6L50 Upper Control Valve Body Assembly Right Side Fill in the Blanks Call Out Number

Description

323

Retainer

324

Actuator Feed Limit Valve Spring Actuator Feed Limit Valve

326

Clutch Regulator Valve Spring 1st/Reverse and 45-6 Clutch Regulator Valve

328

Bore Plug Clutch Boost Valve

330

Clutch Boost Valve Spring

313

Control Valve Body Locator Pin 2-6 Clutch Regulator Valve 2-6 Clutch Regulator Valve Gain Valve

Participant Guide


Revised 09/17/08

3-6


6L50 Lower Control Valve Body Assembly Left Side Fill in the Blanks Call Out Number

Description

323

Retainer

328

Bore Plug Shuttle Valve

353

Clutch Select Solenoid Valve Spring Manual Valve TCC Regulator Apply Valve Clutch Piston Dam Feed Regulator Valve

357

Participant Guide


Clutch Piston Dam Feed Regulator Valve Spring

Revised 09/17/08


3-7

6L50 Lower Control Valve Body Assembly Right Side

Fill in the Blanks Call Out Number

Description

323

Bore Plug

328

Retainer Clutch Select Solenoid Valve

Participant Guide


Revised 09/17/08

3-8


6L50 Ball Check Valve Locations

I.D.

Input Oil

Input Oil

Output Oil

1

Drive 1-6

DRV B

CB26/C1234 FD

2

Sol 1

Reverse (Park)

CSV2 Enable

3

Sol 2

C456

CSV3 Enable

4

PS4

C456

CSV2 Latch

5

Drive 1-6

C35R Rev FD

C35R Supply

6

CB26/C1234 FD

--

C1234 FD

7

C35R Supply

--

C35R FD

Participant Guide


Revised 09/17/08


3-9

6L50 Springs / Bolts / Retainers (Metric)

Participant Guide


Revised 09/17/08

Transmissions: New and Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70 Module 4 4L60/4L65/4L70 Automatic Transmissions

4L60/4L65/4L70 Automatic Transmission

4-1

Module 4 Objective Describe product updates and procedures for the 4L60, 4L65 and 4L70 automatic transmission

Refer to Service Information for accurate and current information for the vehicle, component or part being serviced.

2008 4L60 Product Updates •

Bonded Spacer Plate •

•

• •

DT 49037 Mortorq Socket Drive Special Tool

•

• •

Participant Guide

This change adds flat filter screens to the bonded spacer plate assembly to eliminate snap in filters. The current Spacer Plates, Spacer Plate Gaskets, and the service kits that contain them, will be exhausted on Past Model (2006 and prior) 4L60, 4L65 and 4L70 transmissions. Once the inventory for the current Spacer Plates, Spacer Plate Gaskets and the service kits that contain them has been exhausted, past model 4L60, 4L65 and 4L70 transmissions will be serviced with the new Spacer Plate Assembly. The new service kits contain the new Spacer Plate Assembly. To minimize past model cost impact, the current Spacer Plate Gaskets will be maintained for service of individual Spacer Plate Gaskets for 2006 and prior 4L60, 4L65, and 4L70 models.

There is a new bolt with a Mortorq internal drive design for the 4L60 bell housing to case bolts. The new DT 49037 Mortorq Socket Drive Special Tool is required. The current internal drive is Torx-plus. Mortorq internal drive improves extraction force for bolt removal. The new bolts will back-service. There will be a change in torque specification.


Revised 09/17/08

4-2


•

Cooler Line Fittings

•

•

• •

•

•

•

This change revises the 4L60 and 4L80 cooler line fittings to improve performance (due to the use of an external O-ring and an improved internal O-ring material), corrosion resistance. It allows the platform to use both the short and long end forms. Past models will be serviced with new cases and fittings. Past model parts will be maintained. The new aluminum cooler line fittings (2) cannot be used on earlier cases because the threaded hole is not the same size. The previous design (1) will continue to be available through Service Parts Operation. Service cases will be the new case and fittings. The cases with the previous thread design will not be maintained for service. The connection on the hose side will accept both the short snout and the newer longer snout cooler hose assemblies. The fittings have a new torque specification of 20 Newton-meters (14 pounds-feet). They also have one inner and one outer O-ring that are not serviced separately. The new thread size 9/16-18 was implemented 11-29-07 (Julian date 333).

Can the new Cooler Line fittings be used in place of the old style fitting? _______________________________ _______________________________ _______________________________

Participant Guide


Revised 09/17/08

4L60/4L65/4L70 Automatic Transmission

4-3

2009 4L60 Product Updates Pressure Switch Manifold / Internal Mode Switch

•

•

•

•

•

•

•

• •

Participant Guide

The Pressure Switch Manifold (PSM) will be removed, and the Internal Mode Switch (IMS) will be added. Other changes include removal of the 3-2 valve line-up, a new valve body casting, an internal harness, and a manual shaft and detent. Hardware changes include the new IMS, manual shaft, wiring harness, actuator rod assembly, detent roller assembly and valve body. Changes also include removal of the PSM and the Neutral Start Back-Up (NSBU), 3-2 solenoid and 3-2 valve line-up. On the Trailblazer and Envoy, the NSBU will remain external to the transmission due to the configuration circuit for the back-up lights. The Valve Body and new parts will not back-service. All current parts will be maintained. There will be updated bolt torque specifications with the elimination of the PSM bolts. IMS codes were added with the deletion of PSM codes and 3-2 solenoid codes. The temperature sensor in the pressure switch has been moved to the transmission harness.


Revised 09/17/08

4-4


Borg Warner Sprag Clutch •

•

•

•

Oil Pan Bump Out

• •

This newly released Borg Warner forward dual cage sprag clutch and modified overrun clutch hub IS for 4L60, 4L65 and 4L70 applications. Field service uses the Input Sun Gear and Sprag Assembly for heavy duty and regular duty. Parts will back-service.

The Bump-out oil pan in the area of interference is similar to bump-out in other areas. The necessary hardware changes are to the IMS and to the detent lever. This change will back-service.

New Friction Material • •

Friction material has changed to improve clutch durability. The new 3-4 Clutch Plate is a "drop-in" for service.

Participant Guide


Revised 09/17/08

Transmissions: New & Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70 Appendix Parts List for 6T70/75, 6L50, 6L80 & 6L90

Participant Guide


Revised 09/17/08

Appendix

A-1

Parts List This is a partial parts list for updates to the 6T70/75, 6L50, 6L80 and 6L90 automatic transmissions. This list is for information only to be used in conjunction with the Transmissions New & Updates: Product Updates IDL training course. The information in this list neither replaces nor changes any information in Service Information. Refer to Service Information for an accurate and complete list of parts and part numbers for all transmissions and their components.

Part Name

Part Number

Old Part Number

6T70/75 Transmission oil cooler—long snout

25854916

Transmission oil cooler—short snout

15140410

1 bolt lube trough

24239418

(24239047)—2 bolt lube trough

1234 clutch piston housing

24238559

24236049

1234 piston

24238562

24225621

1234 piston inner seal

24242872

24224630

1234 seal/35R inner seal

24242876

24224702

35R clutch piston assembly

24242878

24238560

35R dam o-ring/outer seal

24242877

24225549

3R piston assembly

24238560

24236050

4-5-6 clutch (w/output carrier shaft & dampener) hub assembly

24233660 (non-serviceable)

4-5-6 clutch (w/output carrier shaft) hub assembly

24233788 (serviceable)

6L50 Park Pawl Actuator Assembly

24242086

24237248

AWD output shaft assembly

24248220

24239398

Control Valve Body Spacer (w/Gasket) Plate Assembly

24241875 (all variants)


Fluid seal ring

24246695

24239151

Hub pin

24245241

24227077

Low Clutch Sprag Assembly

24240431

24237334

Park pawl actuator guide assembly

24244365

24224348

Pump Cover, 1234&35R Fluid Seal Ring and New Quad Seal

24246719

24238523

Quad seal

24246701

Release case extension

24245885

24229687

Serviceable pump cover assembly

24246719

24238523

6L50

Participant Guide


Revised 09/17/08

A-2



Part Name

Part Number

Old Part Number


25854916

6L80 1234 clutch piston housing

24238699

24236014

1234 piston

24238700

24224146


24242872

24224630

1234 plate

24238701

24232499

1234 seal

24242870

24224704


24242871

24238696

35R clutch piston inner seal

24236013

24224702

35R clutch plate assembly

24235681

24224148

35R clutch spring

24236011

24224878


24242869

24224698

35R inner seal

24242868

24236013

35R piston assembly

24238696

24236009

456 Housing Assembly

24237556

24232411

6L80 spacer plate

24245437

24242052

6L80/90 CBLR Snap Ring

24224737 (current) 24245063 (thicker) 24245064 (thinner)

Control valve body spacer (w/Gasket) Plate Assembly

24241875


Fluid seal ring

24246695

24238248

Hub pin

24245241

24227077

Manual shaft detent assembly

24242341

24222646

Manual Shaft detent lever assembly (GMX 215/294 apps)

24242343

24234565

Park Pawl Actuator Assembly

24242085

24237247


24244365

24224348

Participant Guide


Revised 09/17/08

Appendix: Parts List

A-3


Part Name

Part Number

Old Part Number


25854916

Quad seal

24246701


2426698

24238247

Spacer plate

24236005

24236189

Valve bore plug

24242814

24225221


24242872

24224630

1234 seal

24242870

24224704


24242871

24238696


24242869

24224698

35R inner seal

24242868

24236013

6L80/90 CBLR Snap Ring

24224737 (current) 24245063 (thicker) 24245064 (thinner)

6L90 456 Housing

24238827

24232423

6L90 Park Pawl Actuator Assembly

24226671

24242088

6L90 park pawl actuator guide assembly

24244363

24226669

Fluid seal ring

24246695

24238248

Hub pin

24245241

24227077


24244363

24226669

Quad seal

24246701


2426698

6L90

24238247

Tools DT 47868-4 Clutch Travel Weight Adapter tool

Measures clutch braking low reverse (CBLR) and 2-6 clutch travel

DT 48989 Holding Fixture

Accommodates gradual tooling changes from case suppliers

Participant Guide


Revised 09/17/08

Transmissions: New & Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70 Evaluation Instructions

Service Technical Level 1 Evaluation Transmissions: New and Updates 6T70/6T75, 6L50/6L80/6L90, 4L60/4L65/4L70

E-1 Course #17440.13D

Level 1 Evaluation GM Training now uses an online evaluation for all WBT, IDL and Hands-On courses. This gives you an opportunity to provide feedback to GM Training on the quality and value of the training that you just have completed. (a)

How does it work?

The first time you log in to gmtraining.com after receiving credit for completing this course, your homepage will include a notification that you have an evaluation to complete. To complete the evaluation, click on the link provided to go to your "My Evaluations" page. The "My Evaluations" page will also list any other evaluations that you have not completed. (b) What if I don't complete an evaluation right away? If you choose to skip the evaluation when you receive the notification, you will have two weeks to go back and complete it. To complete an evaluation that you have skipped, click on the “Provide your feedback” link on the Homepage. (See graphic to the right for reference.) (c) Questions? If you have any questions, log onto www.gmtraining.com in the “Contact Us,” or please contact the GM Training Help Desk at (888) 748-2687.

Version 1.0


Revised 09/17/08

6T70 6L80

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