SAE TECHNICAL PAPER SERIES 932418 Off-Highway Transmission Modernization Timothy J. Cooney John R. Wiley Allison Transmission Division General Motors Corporation t The Engineering Society ' For Advancing Mobility ' Land Sea Air and Space- INTERNATIONAL 1993 International Off-Highway & Powerplant Congress & Exposition Milwaukee, Wisconsin September 13-15, 1993 400 COMMONWEALTH DRIVE, WARRENDALE, PA 15096-0001 U.S.A. Downloaded from SAE International by University of Edinburgh, 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. The consent is given on the condition, 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 01970 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. Global 'Mobility WDatabase1 AH SAE papers, standards, and selected books are abstracted and mde*ed m the SAE Global Mobility Database No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. ISSN 0148-7191 Copyright 1993 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 sotey 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 a 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 U.S.A. 90-1203PG Downloaded from SAE International by University of Edinburgh, Saturday, August 25, 2018932418 ABSTRACT The 40-plus year history of the off-highway automatic transmission has been characterized by change. Ever- increasing demands in the marketplace have caused an evolution of design and features in transmissions to maintain competitive advantage. Allison Transmission's new models, CL(B)T-5963 and CL(B)T-6063, are being released to improve productivity and driveability. The incorporation of a programmable trim boost feature in the Allison Transmission Electronic Controls makes possible improved shift quality that will increase driver comfort. The addition of a two-speed reverse allows for a deep ratio reverse that helps provide ample pulling power to negotiate through severe conditions, and a shallow ratio to give increased speed in reverse that will help reduce cycle time. INTRODUCTION In the 40 plus year history of Allison Transmission's off- highway product line, one thing that has been constant has been change. From the first attempts 45 years ago to make an automatic transmission by combining a torque converter, a gear box and some controls, ever-increasing demands in the marketplace have caused an evolution of the off-highway automatic transmission that would never have been expected at the beginning. The 1990s and beyond will be no exception. Increased competition with these mature products has shifted designs to provide more features that improv