THM 200-4R

INDEX
APPLICATION CHART........................................................ ............................................................................... 3
GENERAL DESCRIPTION......................................... ........................................................................................ 4
LINE PRESSURE CHECK............................................. ...... ................................................................................ 5
DIAGNOSTIC CHARTS............ ........................................................................................................................... 7
1990 WIRING SCHEMATICS.................. .............................................................................................................. 19
OIL PASSAGE IDENTIFICATION........................................................ ............................................................... 20
CASE CHECKBALL LOCATIONS....................................................................................................................... 23
VALVE BODY CHECKBALL LOCATIONS ........................................................................................................ 24
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TRANSMISSION DISASSEMBLY........................................................................................................................ 25
COMPONENT REPAIR AND RE-ASSEMBLY............... ..................................................................................... 38
REAR END-PLAY MEASUREMENT........................................... ......................................................................... 44
FORWARD AND DIRECT CLUTCH HOUSING ASSEMBLY............................................................................. 45
CENTER SUPPORT ASSEMBLY............................................................................................................................ 52
FORWARD CLUTCH SHAFT END-PLAY CHECK............................................................................................. 53
OVERDRIVE SECTION AND 4TH CLUTCH ASSEMBLY ................................................................................ 55
INSTALLING 4TH CLUTCH OIL DEFLECTOR................................................................................................. 62
PUMPASSEMBLY....................................................................... ............................................................................. 64
OVERDRIVE UNIT END-PLAY MEASUREMENT............................................................................................. 67
BUSHING REPLACEMENT PROCEDURES (ALL)........................................................................................... 81
TORQUE SPECIFICATIONS...................................................... ........................................................................... 85
SPECIAL TOOL REQUIREMENTS....................................................................................................................... 86
PARTS EXPLODED VIEWS.................................................................................................................................... 87
1986 WIRE HARNESS IDENTIFICATION............................................................................................................ .95
1989 WIRE HARNESS IDENTIFICATION............................................................................................................ .96

AUTOMATIC TRANSMISSION SERVICE GROUP

18639 S.W. 107TH AVENUE
MIAMI, FLORIDA 33157
(305) 670-4161
Copyright © ATSG 1999

2
 Updated
October, 2003

INTRODUCTION
THM 200-4R
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.

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 under

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license from General Motors Corp, Service & Parts Operations

License Agreement Number 0510718."

The information and part numbers contained in this booklet have

been carefully compiled from industry sources known for their
reliability, but ATSG does not guarantee its accuracy.

DALE ENGLAND JIM DIAL

FIELD SERVICE CONSULTANT TECHNICAL CONSULTANT
WAYNE COLONNA ED KRUSE
TECHNICAL SUPERVISOR TECHNICAL CONSULTANT
PETER LUBAN GREGORY LIPNICK
TECHNICAL CONSULTANT TECHNICAL CONSULTANT
JON GLATSTEIN DAVID CHALKER
TECHNICAL CONSULTANT TECHNICAL CONSULTANT
ROLAND ALVAREZ JERRY GOTT
TECHNICAL CONSULTANT TECHNICAL CONSULTANT
GERALD CAMPBELL MIKE SOUZA
TECHNICAL CONSULTANT TECHNICAL CONSULTANT

AUTOMATIC TRANSMISSION SERVICE GROUP

18639 S.W. 107TH AVENUE
MIAMI, FLORIDA 33157
(305) 670-4161
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