SA E TECHNICAL PA PER SERIES The Engineering Society =For Advancing Mobility and Sea Air and Space, Allison World Transmission Developments John R. Buttermore Ted M. McQuinn Allison Transmission Division General Motors Corporation I/- AX- 9/ International Truck & Bus Meeting and Exposition Chicago, Illinois November 18-21,1991 400 COMMONWEALTH DRIVE, WARRENDALE, PA 15096-0001 U.S.A. 90-0723PG Downloaded from SAE International by University of New South Wales, Saturday, August 25, 2018The appearance of the 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. Thisconsent isgiven on thecondition, however, that the copier pay a$5.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 27 Congress St., Salem, MA 01 970 for copying beyond that permitted by Sections 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 Service Department. To obtain quantity reprint rates, permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. All SAEpapers standards and seiecred books are abstracted and indexeo in the SAE Global Mobilltv Dafabase No part of this publication may by reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. ISSN 0148-7191 Copyright 1991 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 published in SAE transactions. For permission to publish this paper in full or in part, contact the SAE Publications Division. Persons wishing to submit papers to be considered for presentation or publication through SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Activity Board, SAE. Printed in USA 90-1203~~ Downloaded from SAE International by University of New South Wales, Saturday, August 25, 2018Allison World Transmission Developments ABSTRACT A new line of automatic electronically con- trolled transmissions has been undergoing develop- ment by Allison Transmission Division. The first of three models in the family has been introduced into production in September, 1991. Extensive efforts in assuring the reliability of the product and in meet- ing customer needs have resulted in several product modifications over the initially concepted product. Exhaustive efforts in integrating the design and the factory are resulting in major returns on pro- ducibility and quality from the production floor reflecting the total ground up approach to design and manufacturing the new World Transmission Family of heavy duty automatic transmissions. INTRODUCTION The purpose of this paper is to describe the design features and development background of the MD automatic transmission designed and manufac- tured by Allison Transmission Division of General Motors Corporation. The MD is the first in a series of fully automatic transmissions making up the World Transmission Family to be introduced in the mar- ketplace over the next three years. The first section of the paper describes the de- sign features and the electronic control system de- veloped specifically for the new transmission family. A discussion on the market and application require- ments for the product is also included. The second section discusses th