400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 982798 Introducing TRANSYND  , a New Severe Duty Extended Drain Interval Fuid for Allison Heavy Duty Automatic Transmissions Thomas L. Johnson General Motors Corporation International Truck and Bus Meeting and Exposition Indianapolis, Indiana November 16-18, 1998Downloaded from SAE International by University of Edinburgh, Sunday, August 26, 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 ascopying 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 wr itten 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 p ublished 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 3 00 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 Edinburgh, Sunday, August 26, 20181982798 Introducing TRANSYND  , a New Severe Duty Extended Drain Interval Fuid for Allison Heavy Duty Automatic Transmissions Thomas L. Johnson General Motors Corporation Copyright © 1998 Society of Automotive Engineers, Inc. ABSTRACT Allison Transmission and Castrol Industrial North Amer- ica have teamed up to offer a new synthetic automatictransmission fluid specially formulated for heavy dutyautomatic transmissions. The new product is calledTRANSYND™ 1 and is approved for use in all current transmission models in all current truck and bus applica-tions. Allison’s worldwide customers now have a new option when selecting transmission fluid. Customers may con-tinue to choose from a wide variety of approvedDEXRON -III or Allison C4 quality fluids or they may elect to switch to TRANSYND  and extend drain inter- vals. TRANSYND  has been shown to be cost effective by reducing maintenance through extended drain inter-vals while providing superior performance. Benefits maybe optimized in severe vocations such as transit fleetswhere there are more vehicles and fluid change intervalstend to be more frequent. Similar savings may also beachievable in general (lighter) duty vocations such asschool buses, motor homes, etc. Life Cycle Cost analysissoftware has been developed to evaluate potential sav-ings based on a customer’s individual operating condi-tions and maintenance practices. Testing at all levels has demonstrated