400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 980821 General Motors 4T65-E Electronic Four-Speed Automatic Transaxle Patrick Thompson, John Marano, Jean Schweitzer, Sohail Khan and Jasbir Singh GM Powertrain Reprinted From: 1998 Transmission and Driveline Systems Symposium: New Developments and Advanced Concepts in Systems and Components (SP-1324) International Congress and Exposition Detroit, Michigan February 23-26,1998Downloaded from SAE International by University of British Columbia, Monday, August 20, 2018The appearance of this ISSN code at the bottom of this page indicates SAE’s consent that copies of the paper may be made for personal or internal use of specific clients. This consent is given on the condition, however, that the copier pay a $7.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 222 Rosewood Drive, Danvers, MA 01923 for copying beyond that permitted by Sec- tions 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Sales and Satisfaction Department. Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Department. To request permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior wri tten permission of the publisher. ISSN 0148-7191 Copyright 1998 Society of Automotive Engineers, Inc. Positions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by which discussions will be printed with the paper if it is pu blished in SAE Transactions. For permission to publish this paper in full or in part, contact the SAE Publications Group. Persons wishing to submit papers to be considered for presentation or publication through SAE should send the manuscript or a 30 0 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USAAll SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility DatabaseDownloaded from SAE International by University of British Columbia, Monday, August 20, 20181980821 General Motors 4T65-E Electronic Four-Speed Automatic Transaxle Patrick Thompson, John Marano, Jean Schweitzer, Sohail Khan and Jasbir Singh GM Powertrain ABSTRACT The 4T65-E transmission produced by General Motors is the third evolution of GM’s original 4-speed F.W.D. auto- matic. This most recent redesign introduced for the 1997 model year meets new corporate goals for fuel economy and reduced noise, along with the ability to adjust shift character to meet the brand image of the various name- plates. Improving fuel economy and cooling at increased engine power levels was enabled by designing a larger diameter torque converter with the aid of 3-D modeling. The new converter has reduced internal leakage and incorporates a controlled slip clutch. Improvements in NVH have been achieved through a revised oil pump design and the use of the new phased drive chain, made affordable by the joint development of powdered metal technology required for the unique sprocket design. INTRODUCTION The purpose of this paper is to introduce the reader to changes that have been made to an existing F.W.D. auto- matic transmission. This evolution takes a proven design, the 4T60-E transmission, and enhances its efficiency for improved cooling and fuel economy, enables better shift control, reduces lev