INDEX

Copyright © ATSG 2004

FORD MOTOR CO. 4F20E

AUTOMATIC TRANSMISSION SERVICE GROUP18639 SW 107TH AVENUEMIAMI, FLORIDA 33157

(305) 670-4161

VEHICLE APPLICATION................................... .............................................................................................. 4

DESCRIPTION APPLICATION ........................................................................................................................ 5

COMPUTER SENSORS........................................... .......................................................................................... 10

TROUBLE SHOOTING...................................................................................................................................... 13

TRANSAXLE DISASSEMBLY............................ .............................................................................................. 26

VALVE BODY.................................................. ................................................................................................... 41

DIFFERENTIAL........................................................... ............... ..................................................................... 57

TRANSAXLE COMPONENTS.................. ................................ ....................................................................... 62

TRANSAXLE ASSEMBLY.................................. ................................................................................................ 74

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.

Copyright © ATSG 2004

INTRODUCTIONFORD 4F20E

AUTOMATIC TRANSMISSION SERVICE GROUP18639 SW 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.

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

We wish to thank Ford Motor Companyfor the information and illustrationsthat have made this booklet possible.

The 4F20E electronically controlled automatic transaxle features a combination of electronic and mechanical systems to control forward gear shifting torque converter lock-up for quietness and economy and self diagnosis capability for simplifying trouble shooting procedures.

The electronic system controls the tranxaxle shifting in forward speeds and controls torque converter lock-up by means of solenoid actuated valves. These shift solenoid valves, when activated apply the friction elements (clutches and bands) to control shifting in the planetary gear. The shift timing and lock-up events are regulated by the TCM in programmed logic and in response to input sensors and switches to produce optimum performance.