Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 (1989)
Clutch: All Technical Service Bulletins
A/T - Slips In First or No First Gear
Bulletin 89-7125-13
Date
Nov., '89
Ref. No. 89-264-7125
Corp. Ref. No. 977147
Figure 1
SUBJECT:
SLIPS IN FIRST AND/OR NO FIRST GEAR
MODELS AFFECTED: 1980-1989 3T40 (THM125C) TRANSAXLES
BULLETIN COVERS
New Forward Clutch Piston Seals (626, 627) made of Viton. These new Viton seals replace the currently used lip seals which may become brittle and
take a permanent heat set (become flat) with high mileage, allowing possible leaks in the forward clutch (624). Refer to Figure 1.
DATE OF PRODUCTION CHANGE
Viton seals went into production for all Willow Run built Hydra-matic 3T40 (THM125C) transaxles October 6, 1989 (Julian Date 279).
SERVICE PROCEDURE
This new Viton seal can be used on all model year Hydra-matic 3T40 (THM125C) transaxles.
SERVICE PARTS INFORMATION
Refer to the following part number when ordering new Viton seals to service the forward clutch assembly.
Part Number
Description
8631986
Piston Seals (Viton), Forward Clutch
Current packages will be revised to contain new Viton seals. Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE
