NOISE-GROWL/RUMBLE DRIVER SIDE (AT 32-63 MPH)

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

Model and Year: 199O L VAN WITH STANDARD WHEEL BASE (L1O9)

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.

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.