Firebird V8-305 5.0L VIN F FI (1987)
Clutch: All Technical Service Bulletins
A/T - 4L60 New Steel 3-4 Clutch Plates Available
Bulletin Number:
91-7-18
Reference Number:
077138
Publish Date:
11/90
Subject:
NEW 3-4 CLUTCH PLATES (STEEL)
Models
Affected:
1987-91 FIREBIRD MODELS WITH 4L60 TRANSMISSION
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:
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.