A/T - Designation System Change
88chevy31Number: 89-25-7A
Section: 7A
Date: NOV., 1988
Subject: TRANSMISSION/TRANSAXLE DESIGNATION SYSTEM CHANGE
Model and Year: 1989 PASSENGER CARS AND LIGHT DUTY TRUCKS WITH HYDRAMATIC TRANSMISSION/TRANSAXLES
TO: ALL CHEVROLET DEALERS
This bulletin covers the introduction of a Designation System for Hydra-matic products that is consistent in defining the torque capacity and other features of our products. This Designation system will enhance Hydra-matic's worldwide product recognition, promote technical understanding, and designate the evolution of new or existing products. The new Designation system affects all Vehicles Equipped With Hydra-matic Transmission/Transaxles Foreign and Domestic.
DATE OF PRODUCTION CHANGE:
The 1989 and 1990 model years will be transitional years with publications referencing both the new and previous designations. In the 1991 model year publications will no longer reference previous designations as changeover to the new designations will be complete.
Phase-in of Product Designation System by Model Year:
1989: THM 125C/Hydra-matic 3T40 (dual designation)
1990: Hydra-matic 3T40* *Previously THM 125C (footnote
only)
1991: Hydra-matic 3T40 (changeover complete, no other
designation referenced)
The chart below will be used for all product designations. For example, with the new system, the product designation for the THM 125C will be Hydra-matic 3T40. Additional examples below.
3 T 40 A
Number
of Speeds: Type: Series: Major Features:
3 T-Transverse Based On E-Electronic
4 L-Longitudinal Relative Controls
5 Plus Torque A-All Wheel
V (CVT) M-Manual Capacity Drive
HD-Heavy Duty
SERVICE NOTES:
Listed below are current Hydra-matic products with their Previous and New Designations.
Previous Designations New Designations
Automatic Products
THM 180/180C Hydra-matic 3L30
THM 125/125C Hydra-matic 3T40
THM 700-R4 Hydra-matic 4L60
THM 440-T4 Hydra-matic 4T60
THM 400 Hydra-matic 3L80
THM 475 Hydra-matic 3L80-HD
THM 200-4R THM 200-4R
Manual Products
HM-290 Hydra-matic 5LM60
HM-282 Hydra-matic 5TM40
HM-117 HM-117