Syclone V6-262 4.3L Turbo (1991)
Torsion Bar: All Technical Service Bulletins
Suspension - Knocking/Rattling Noise
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.
