A/T GEAR WHINE/HIGHWAY SPEEDS (INSTALL SHAFT SET)

Model and Year: 1985-88 "M" CARS

TO: ALL CHEVROLET DEALERS

Some of the subject vehicles may exhibit a gear noise condition which can be recognized as a medium-high pitch whine at highway speeds (commonly 45-55 mph.), the volume of the noise changes as the accelerator is depressed or released and load is applied or reduced at the mating gears.

Changes have been made to the manufacturing process to provide quieter running output gears. Vehicles beginning with the following VINs incorporate these revised parts:

2 Door JGlMR215XJK771366 4 Door JGlMR6154JK771368

Vehicles produced prior to the above VINs should be serviced using P/N 96061778 - shaftset, output; during installation, the ring, output shaft seal - P/N 96053887 should also be replaced, both of these parts are available from GMSPO.

Removal and installation of the components can be carried out following Service Manual procedures.

Labor Operation Number: K7610 Labor Time : 5.8 Hours

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.