KNOCKING NOISE-TORSION BAR DAMAGED OR BROKEN-NEW PART

Subject: KNOCKING NOISE-TORSION BAR SUPPORT INSULATOR DAMAGED/BROKEN

Model and Year: 1988-91 T TRUCKS

Some owners of 1988-1991 T trucks may comment about a knocking or rattling sound coming from the underside of their vehicle. This sound can occur if the torsion bar support insulator is damaged or breaks. To correct this condition, a new more durable torsion bar insulator has been released. The new insulator is visually identical to the previous insulator and the installation procedure has not changed (reference S-10 Service Manual, Section 3C).

VEHICLES INVOLVED:

The new torsion bar support insulators have been installed on vehicles after the following VIN breakpoints.

Shreveport 1GDCT14Z9M8801063

Pontiac West 1GCCS14A7M0190577

Moraine 1GCCS19RlM2273070

SERVICE PARTS INFORMATION:

Part Number Description 15677665 Insulator, Torsion Bar Support

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

Labor Operation: E3340

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.