A/T - Loss or Drive, Slip, or No Drive
90chevy31Number: 90-356-7A
Section: 7A
Date: October 1990
Corp. Bulletin No.: 077135
Subject: LOSS OF DRIVE, SLIP OR NO DRIVE
Model and Year: 1990 C, K, P, R, V TRUCKS AND G VAN WITH 3L80 AND 3L80-HD AUTOMATIC TRANSMISSION
Figure 1:
TO: ALL CHEVROLET DEALERS
BULLETIN COVERS: (Figure 1)
Some HYDRA-MATIC 3L80 models built from August 1st (Julian Date 213) through October 1989 (Julian Date 304) may have lost all forward ranges. This may be caused by an unfinished turbine shaft journal which distresses the stator shaft rear bushing and causes loss of forward clutch. Changing the Turbine shaft, Forward Clutch Housing Assembly and Pump Cover Assembly will eliminate any future concerns. If further inspection shows any contamination, the Converter Assembly should also be replaced.
SERVICE PARTS INFORMATION:
Part Number Part Name
8624772 Shaft - Turbine
8624908 Package, Forward Clutch Housing & Washer
8625955 Package, Cover Assembly Pump
SERVICE MANUAL REFERENCE:
Refer to the Unit Repair Section of the appropriate Service Manual for the proper replacement procedures.
Parts are currently available from GMSPO.