DIFFER. GEAR WEAR OR DIRECT CLUTCH DRUM BUSHING WEAR

TRANSMISSION APPLICATIONS: SUBJECT:

1985 THROUGH 1987 SEKI AUTOMATIC TRANSMISSION WEAR AUTOMATIC TRANSMISSION

TRANSMISSION MODELS: VEHICLE APPLICATIONS:

ALL MODELS 1985-87 "M" CAR WITH AUTOMATIC TRANSMISSION

(This bulletin is revised to add information under the Differential Side and Pinion Gears Worn heading.)

BULLETIN COVERS:

Some of the subject vehicles may experience improper operation of the automatic transmission due to wear of the differential side and pinion gears and/or wear of the direct clutch drum bushing.

Corrective action was incorporated in vehicles built after the following serial numbers (last 8 VIN characters) :

HK740463 (2 door), HK740416 (4 door) for differential side and pinion gear wear.

HK746352 (2 door), HK746297 (4 door) for direct clutch drum bushing wear.

Vehicles exhibiting these conditions built before the above serial numbers, should be repaired using the following parts.

Differential side and pinion gears worn. -

Replace worn/damaged parts as required, using new transmission case P/N 96057455, following shop manual procedures.

Direct clutch drum bushing and associated parts worn/damaged. -

Three different sets of replacement parts are available and the appropriate set should be ordered according to the extent of repair/replacement required. The sets and contents are described as follows:

Pump Set, Oil P/N 96057153 Oil Pump 96057143 Ring, Oil Pump Cover Seal 96057149 Drum, Direct Clutch 96057146 Seat, Return Spring 96057147 Ring, Clutch Plate Snap 96057148 Washer, Direct Clutch 96057150 Washer, Direct Clutch 96057151

Cover Set, Oil P/N 96057154 Pump Composes: Cover, Oil Pump 96057144 Ring, Oil Pump Cover Seal 96057149 Seat, Return Spring 96057147 Ring, Clutch Plate Snap 96057148 Washer, Direct Clutch 96057150 Washer, Direct Clutch 96057151 Drum, Direct Clutch 96057146

Cover Set, Direct P/N 96057155 Multi Disc Cover, Oil Pump 96057144 Composes: Ring, Oil Pump Cover Seal 96057149 Clutch, Direct Multi-Disc. 96057145 Washer, Direct Clutch 96057150 Washer, Direct Clutch 96057151

Follow shop manual procedures when installing any of the above sets of parts.

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.