Operation CHARM: Car repair manuals for everyone.

A/T - 4L60 Steel 3-4 Clutch Plate Availability

90Chevy35
Number: 91-112-7A

Section: 7A

Date: November 1990

Corp. Bulletin No.: 077138
Subject: NEW 3-4 CLUTCH PLATES


Model and Year: 1987-91 CAPRICE, CAMARO, CORVETTE WITH 4L60 AUTOMATIC TRANSMISSION
1987-91 C/K, G, M, R/V, S/T TRUCK AND 1990-91 L TRUCK WITH 4L60 AUTOMATIC TRANSMISSION
TO: ALL CHEVROLET DEALERS

BULLETIN COVERS:

New 3-4 clutch plates (steel) are available for 1987-1990 HYDRA-MATIC 4L60 transmissions. The new clutch plates have a slightly smaller outer radius to let them move more freely in the clutch housing.

DATE OF PRODUCTION CHANGE:

Beginning July 27, 1990 (Julian Date 208), all HYDRA-MATIC 4L60 transmissions were built using the new 3-4 clutch plates.

SERVICE INFORMATION:

The new 3-4 clutch plates can be used to service any HYDRA-MATIC 4L60 transmission produced after February 9, 1987 (Julian Date 040).

SERVICE PARTS INFORMATION:

Description New Part #

Plate - 3rd and 4th (steel - 4 or 5 needed) 8678053
Plate - 3rd and 4th (steel - 1 needed) 8678054

Parts are currently available from GMSPO.

SERVICE MANUAL REFERENCE:

Refer to the Automatic Transmission Unit Repair Section of the appropriate service manual for 3-4 clutch plate removal and installation information.