ATSG Tech Manual 8L90 - GM Cadillac Chevy GMC

 

Automatic Transmission Service Group - ATSG Techtran rebuild manual

Product specifics:

ATSG part number: 8L90

Book type: Rebuild and overhaul

Covered models: 8L90, 8L45, 8L90E, 8L45E Hydra-Matic, 8 speed automatic

Makes: Cadillac, Chevrolet, GMC, GM

Transmission RPO: M5N, M5T, M5U, M5X

Year range: 2014-up

Format: Paperback

Pages: 138

UPC: 858840006061

Country of origin: USA

Copyright date: 2018

 

This book contains detailed information regarding the following:

Assembly and disassembly procedures

Bushing locations

Checkball locations

Clutch clearance specifications

Electrical volt and ohms information

Endplay check and recommendations

Line pressure check procedures and specs

Recommended tools list – Not all required

Thrust washer locations

Torque specifications

Torrington bearing locations

Transmission model application codes

Trouble codes and fixes

Trouble shooting

Valve body assembly detail for valves and springs

 

Covered vehicle models:

Cadillac:

ATS, 2.0L, 3.6L, 2015-2018

CT6, 2.0L, 3.0L, 3.6L, 2016-2018

CTS, 2.0L, 3.6L, 2015-2018

CTS-V, 6.2L, 2015-2018

Escalade, 6.2L, 2015-2018

Chevrolet:

Camaro, 2.0L, 3.6L, 6.2L, 2015-2018

Colorado, 2.8L, 3.6, 2015-2018

Corvette, 6.2L, 2014-2018

Silverado, 5.3L, 6.2L, 2014-2018

Express van, 2.8L Diesel, 2017-2018

GMC:

Canyon, 2.8L, 3.6L, 2016-2018

Sierra, 5.3L, 6.2L, 2014-2016

Savana van, 2.8L Diesel, 2017-2018

Yukon, 6.0L, 6.2L, 2014-2018

 

HYDRAMATIC 8L90 Manual - The 8L90E transmission is a fully automatic eight speed rear wheel drive transmission that is available in both two and four wheel drive configurations. It features clutch to clutch shifting which provides eight forward and one reverse gear. It also uses a four element lockup torque converter, four planetary gear sets as well as five multiple disc and one mechanical clutch set. The 8L90 utilizes an off axis chain drive pump to maintain fluid volume and operating pressures. The externally located TCM controls the changing of gear ratios through the use of solenoids and also controls transmission line pressure through the use of a variable force motor. The TCM will also control converter clutch operation. The 8L90 has undergone some parts changes from its inception until the present. Some of those changes are indicated in this manual and some are not.

This manual will address the disassembly and assembly procedures for the 8L90 and is intended for use by the professional technician. 

ATSG produces the overhaul books that transmission mechanics; both professional and DIY, have looked to since 1985.