LOSS OF DRIVE/SLIP OR NO DRIVE CHECK TURBINE SHAFT JOURNAL

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

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.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.