INDEX

Copyright © ATSG 1999

THM 200-4R

2

APPLICATION CHART........................................................ ............................................................................... 3GENERAL DESCRIPTION......................................... ........................................................................................ 4LINE PRESSURE CHECK............................................. ...... ................................................................................ 5DIAGNOSTIC CHARTS............ ........................................................................................................................... 71990 WIRING SCHEMATICS.................. .............................................................................................................. 19OIL PASSAGE IDENTIFICATION........................................................ ............................................................... 20CASE CHECKBALL LOCATIONS....................................................................................................................... 23VALVE BODY CHECKBALL LOCATIONS ........................................................................................................ 24TRANSMISSION DISASSEMBLY........................................................................................................................ 25COMPONENT REPAIR AND RE-ASSEMBLY............... ..................................................................................... 38REAR END-PLAY MEASUREMENT........................................... ......................................................................... 44FORWARD AND DIRECT CLUTCH HOUSING ASSEMBLY............................................................................. 45CENTER SUPPORT ASSEMBLY............................................................................................................................ 52FORWARD CLUTCH SHAFT END-PLAY CHECK............................................................................................. 53OVERDRIVE SECTION AND 4TH CLUTCH ASSEMBLY ................................................................................ 55INSTALLING 4TH CLUTCH OIL DEFLECTOR................................................................................................. 62PUMP ASSEMBLY....................................................................... ............................................................................. 64OVERDRIVE UNIT END-PLAY MEASUREMENT............................................................................................. 67BUSHING REPLACEMENT PROCEDURES (ALL)........................................................................................... 81TORQUE SPECIFICATIONS...................................................... ........................................................................... 85SPECIAL TOOL REQUIREMENTS....................................................................................................................... 86PARTS EXPLODED VIEWS.................................................................................................................................... 871986 WIRE HARNESS IDENTIFICATION............................................................................................................ .951989 WIRE HARNESS IDENTIFICATION............................................................................................................ .96

AUTOMATIC TRANSMISSION SERVICE GROUP18639 S.W. 107TH AVENUEMIAMI, FLORIDA 33157

(305) 670-4161

INTRODUCTION

THM 200-4R

AUTOMATIC TRANSMISSION SERVICE GROUP18639 S.W. 107TH AVENUEMIAMI, FLORIDA 33157

(305) 670-4161

1

No part of any ATSG publication 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, recording or otherwise, without written permission of Automatic Transmission Service Group. This includes all text illustrations, tables and charts.

"Portions of materials contained herein have been reprinted underlicense from General Motors Corp, Service & Parts Operations

License Agreement Number 0510718."

The information and part numbers contained in this booklet havebeen carefully compiled from industry sources known for their

reliability, but ATSG does not guarantee its accuracy.

UpdatedOctober, 2003

DALE ENGLANDFIELD SERVICE CONSULTANT

ED KRUSETECHNICAL CONSULTANT

WAYNE COLONNATECHNICAL SUPERVISOR

PETER LUBANTECHNICAL CONSULTANT

JIM DIALTECHNICAL CONSULTANT

GREGORY LIPNICKTECHNICAL CONSULTANT

JERRY GOTTTECHNICAL CONSULTANT

JON GLATSTEINTECHNICAL CONSULTANT

DAVID CHALKERTECHNICAL CONSULTANT

ROLAND ALVAREZTECHNICAL CONSULTANT

MIKE SOUZATECHNICAL CONSULTANT

GERALD CAMPBELLTECHNICAL CONSULTANT

This booklet contains the general description, diagnosis charts, and the procedures necessary to overhaul, repair or service the General Motors THM 200-4R four speed automatic overdrive transmission. This information will assist you in training your technicians to provide your customers with the best possible transmission service that is available.