A/T - 4L60 Steel 3-4 Clutch Plate Availability
90Chevy35Number: 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.