Cause | Correction | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Inspect for the proper gear oil levels prior to performing system diagnosis. | |||||||||
Loose propeller shaft mounting bolts | Tighten the bolts, as required. Refer to Propeller Shaft Replacement. | ||||||||
Worn propeller shaft constant velocity joint | Replace the propeller shaft assembly. Refer to Propeller Shaft Replacement. A worn propeller shaft constant velocity joint may create a clicking, grinding, or snapping type noise. | ||||||||
Worn or loose center bearing assembly | Replace the center bearing assembly, as required. A worn center bearing assembly may cause vehicle vibration or a grinding or squealing type noise. | ||||||||
Worn universal joints | Replace the universal joints, as required. A worn universal joint may create a clicking or snapping type noise. | ||||||||
Worn axle shaft constant velocity joints | Replace/repair the constant velocity joints, as required. A worn axle shaft constant velocity joint may create a clicking, grinding, or snapping type noise. | ||||||||
Rear axle noise | |||||||||
Loose mounting bracket | Tighten the bracket bolts or replace the bracket, as required. | ||||||||
Loose transfer case-to-transmission mounting bolts | Tighten the bolts, as required. | ||||||||
Incorrect gear oil | Replace with synthetic gear oil GM P/N 12378514 (Canada P/N 88901045). | ||||||||
Bearing noise within the transfer case | A grinding or roar type noise will increase or decrease relative to the vehicle speed.
| ||||||||
Gear set whine noise within the transfer case | Whine type noises will increase or decrease relative to the vehicle speed, approximately 80-90 km/h (50-60 mph).
Contributing factors may include:
| ||||||||
