Sierra 3500 4WD V8-6.6L DSL Turbo VIN 2 (2004)
Catalytic Converter: All Technical Service Bulletins
Exhaust System - Moan/Vibration at 55-60 MPH
Bulletin No.: 05-06-05-002
Date: July 27, 2005
TECHNICAL
Subject:
Exhaust Moan/Vibration (Replace Converter Assembly and Exhaust Muffler Assembly)
Models:
2004-2005 Chevrolet Silverado 2500HD/3500HD Series Crew Cab Short Box Pickups
2004-2005 GMC Sierra 2500HD/3500HD Series Crew Cab Short Box Pickups
with 6.6L Diesel Engine (VIN 2 - RPO LLY)
Condition
Some customers may comment on a moan or vibration at vehicle speeds approximately 87-97 km/h (55-60 mph) and at approximately 1700-1800 RPM.
Correction
Replace the catalytic converter assembly and exhaust muffler assembly using the procedure listed below.
1.
Raise and suitably support the vehicle.
2.
Remove the spare tire.
3.
Install adjustable jack stands under the rear axle.
4.
Remove the rear axle vent hose from the rear axle.
5.
Remove the vent hose swivel clip from the rear brake crossover pipe.
6.
Remove the rear shock absorbers lower bolts and nuts.
7.
Lower the rear axle using the adjustable jack stands.
