SAE TECHNICAL PAPER SERIES The Engineering Society ** =For Advancing Mobility a and Sea Air and Space, The Allison B 400R Transmission for Transit Buses Jerry W. Munk Allison Transmission Division General Motors Corporation International Truck & Bus Meeting and Exposition Seattle, WA November 7-9,1994 400 COMMONWEALTH DRIVE, WARRENDALE, PA 15096-0001 U.S.A. Downloaded from SAE International by North Carolina State Univ, Tuesday, September 18, 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 publi- cation. 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. AN SAE Papers Standards, and selected books are abstracted and rndexed m the SAE Global Mob111ty 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 1994 Society of Automotive Engineers, Inc. Positions and opinions advanced in this paper are those of the author(s) and not nec- essarily 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 a presentation or publication through SAE should send the manuscript or a 300 word abstract of a proposed manu- script to: Secretary, Engineering Activity Board, SAE. Printed in U.S.A. 90-1 203ClPG Downloaded from SAE International by North Carolina State Univ, Tuesday, September 18, 2018ABSTRACT The mid-sized transmission, B 400R model, will be dis- cussed in this paper. This model has undergone an extensive design and development program which concentrated on pro- viding a highly reliable and customer accepted transmission system. Much of the development effort went into the areas of driver and passenger comfort and acceptance of the transmis- sion shift quality and retarder operation as well as basic prod- uct reliability. This new product represents the latest technolo- gy in integration of electronics in the automatic transmission and vehicle system to provide the highest customer satisfac- tion and value. INTRODUCTION A new series of bus transmissions has been developed and introduced as a part of the new World Transmission Family of products introduced by Allison Transmission Division. This new line of bus transmissions incorporates unique features developed specifically for the bus voca- tions and includes much more of the transmission system support equipment than previous Allison Transmission Division products. This paper will cover the basic features and the design and development of the new B 400R bus transmission. This model is the mid-range size transmission (Table 1) which is designed specifically for standard city transit buses and other bus applications such as intercity, suburban, and airport shuttle. Table 1. Bus Model Ratings The first section of this paper will cover the specific fea- tures of t