A/T - 3RD Clutch Plate Assembly Identification

91CHEVY02

Number: 91-140-7A


Section: 7A


Date: December 1990


Corporate Bulletin No.: 077153


Subject: 3RD CLUTCH (FIBER) PLATE ASSEMBLY IDENTIFIERS


Model and Year: 1986-90 CELEBRITY AND 1990-91 LUMINA WITH 4T60 AUTOMATIC TRANSMISSION 1991 LUMINA (Z34 ONLY) WITH 4T60-E AUTOMATIC TRANSMISSION


TO: ALL CHEVROLET DEALERS

BULLETIN COVERS:


Identifiers for the 3rd clutch (fiber) plate assemblies for all 1986 through 1991 HYDRAMATIC 4T60, and 1991 HYDRA-MATIC 4T60-E transaxles. The 3rd clutch plate assemblies discussed in Dealer Service Bulletin NO. 86-191 and Dealer Service Bulletin No. 90-21-7A have many different identifier markings. To avoid confusion, it is recommended to order all overhaul and 3rd clutch plate assembly packages by the model and year of the transaxle.

Figure 1 - Markings For 3rd Clutch Plate Assemblies:

SERVICE PROCEDURE: (Figure 1)


When servicing a HYDRA-MATIC 4T60, 4T60-E transaxle, you may notice the 3rd clutch (fiber) plate assemblies have different markings. Listed below are all of the variations of identifiers for the 3rd clutch (fiber) plate assemblies used in all 1986 to the present model transaxles.

1986, 1987 and 1988 models (single sided plates):

^ Four dark blue or black stripes

^ Four yellow stripes

1989 to present models:

^ No stripes with or without the "V" notch

^ Four dark blue or black stripes and the "V" notch

^ Four white stripes and the "V" notch

^ Four yellow stripes with or without the "V" notch

^ Four very faded yellow stripes with or without the "V" notch


IMPORTANT: To ensure the correct 3rd clutch (fiber) plate assembly is used, order all overhaul packages, 3rd clutch plate assembly packages and valve body assemblies by the model code and model year. The identifier markings may change again.