Suspension - Knocking/Rattling Noise

91chevy19

Number: 91-362-3C

Section: 3C

Date: JULY 1991

Corporate Bulletin No.: 163302


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 1GCCS19R1M2273070

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.