Drivetrain - Driveline Clunk When Stopping

Bulletin: 92-74L60-7

Date: Aug. '92

Ref.No.: 92-251-7

Corp.Ref.No.: 964101R

SUBJECT:
DRIVELINE STOP CLUNK (SPECIAL LUBRICANT)

MODELS AFFECTED:
1991-92 ROADMASTER SEDANS AND WAGONS

Normal driveline tension build-up is released following vehicle braking on some 1991-92 Roadmasters as driveline clunk when stopping. The tension build-up is the result of the driveshaft splines binding on the transmission slip yoke.

To eliminate stop clunk due to spline-yoke bind, the driveshaft splines should be lubricated with a special lubricant. This bulletin releases a new lubricant that has increased durability over the previously released lubricant.

NOTICE:
This procedure should be applied to 1991-92 Roadmasters only. When applied to other vehicles, possible transmission lube contamination could result.

SERVICE PROCEDURE:

1. Remove driveshaft.

2. Clean slip yoke and inside of driveshaft spline with solvent and clean cloth.

3. Apply grease (P/N 12345879) to slip yoke spline with a brush or swab, so as to completely cover the entire spline with a light coating of grease.

4. Reinstall driveshaft.

SERVICE PARTS INFORMATION:

Part Number Description

12345879 1 lb. can of special lubricant (should service about
50 vehicles)

Parts are currently available from GMSPO.

WARRANTY INFORMATION

For vehicles repaired under warranty use:

Labor Operation No.:
T7995

Labor Time:
.4 hr.