1989 PRODUCT DESIGNATION SYSTEM

Model and Year: 1989 PASSENGER CARS AND LIGHT DUTY TRUCKS WITH HYDRAMATIC TRANSMISSION/TRANSAXLES

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

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.