A/T - Hydra-Matic Model Designation System
89chevy05GMC NUMBER: 89-T-05
GROUP: OA - General Information
DATE: February, 1989
CORPORATE
NUMBER: 877145
SUBJECT: 1989 PRODUCT DESIGNATION SYSTEM
MODELS: ALL S/T, C/K, R/V TRUCKS AND M, G AND P VANS EQUIPPED WITH HYDRA-MATIC TRANSMISSIONS
The introduction of a designation system for Hydra-matic products that is consistent in defining torque capacity and other features of our products will begin in 1989.
The 1989 and 1990 model years will be transitional years for transmission designations, 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 400/Hydra-matic 3L80 (dual designation)
1990: Hydra-made 3L80 * *Previously THM 400 (footnote only)
1991: Hydra-matic 3L80 (changeover complete, no other designation referenced)
SERVICE NOTES:
Hydra-matic Product Designation System
The chart below will be used for all product designations. For example, with the new system, the product designation for the THM 475 will be Hydra-matic 3L80-HD.
HYDRA-MATIC 3 L 80 HD
manufacturer's
identification Number
(No abbrev.) 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
Listed below are current Hydra-matic products with their Previous and New Designations
Previous Designations New Designations
AUTOMATIC PRODUCTS
THM 700-R4 Hydra-matic 4L60
THM 400 Hydra-matic 3L80
THM 475 Hydra-matic 3L80-HD
MANUAL PRODUCTS
HM-290 Hydra-matic 5LM60
HM-117 HM-117