Suspension - Knocking/Rattling Noise

91chevy16

GMC NUMBER: 91-3C-119

GROUP: 3C Front Suspension

DATE: July, 1991

CORPORATE
NUMBER: 163302


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

MODELS: - 1988-91 T1 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 service manual X9129 section 3C).

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

Shreveport GMC Truck 1GNCT18ZXM8258277
Chevrolet 1GDCT14Z9M8801063
Pontiac GMC Truck 1GTCS14Z6MO527312
West Chevrolet 1GCCS14A7M0190577
Moraine GMC Truck 1GKDT13Z7M2507954
Chevrolet 1GCCS19R1M2273070
Oldsmobile 1GHDT13Z8M2705805


SERVICE PARTS INFORMATION:

Part
Number Description
15677665 Insulator, Torsion Bar Support

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

Labor Operation: E3340

Labor Time: 0.5 hr.