A/T - Gear Whine At Highway Speeds

chevy17

Number: 88-405-7A

Section: 7A

Date: APRIL, 1989
Subject: AUTOMATIC TRANSMISSION GEAR WHINE AT HIGHWAY SPEEDS


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 JG1MR215XJK771366 4 Door JG1MR6154JK771368

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