Prop Shaft, Rear - Growl, Rumble Noise on Driver's Side

9215chevy02

REVISED
Number: 90-281B-4A

Section: 4A

Date: JANUARY 1992

Corporate Bulletin No.: 064102R

ASE No.: A3


Subject: NOISE GROWL RUMBLE ON DRIVER'S SIDE AT 32, 37, 51 AND 63 MPH


Model and Year: 1990 L VAN WITH STANDARD WHEEL BASE (L109)


THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 90-281A-4A, DATED JANUARY 1992. THE MODEL HAS BEEN CORRECTED. ALL COPIES OF 90-281-4A SHOULD BE DISCARDED.

Some owners of 1990 All Wheel Drive "L" vans may comment about a noise which resembles "bad axle bearings" when driving under light or moderate load and peaks at 32, 37, 51, or 63 MPH. This condition will be improved by replacing the rear propshaft with a 3.5" propshaft (P/N 26026738). This new propshaft is more rigid and will significantly improve the noise/vibration associated with this condition.


VIN BREAKPOINTS

Trucks made after the following VIN numbers are equipped with the 3.5" propshaft:
LB133878

SERVICE PROCEDURE:

Refer to the M/L Service Manual section 4A-5 for the procedure for replacement of the propshaft.

SERVICE PARTS INFORMATION

Part Number Description Quantity

26026738 3.5" propshaft 1

Parts are currently available from GMSPO.

WARRANTY INFORMATION

For vehicles under warranty use:

Labor Operation: F1280

Use applicable labor time guide for labor hours.