Cause | Correction | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Inspect for the proper gear oil levels prior to performing system diagnosis. | |||||||||
Loose propeller shaft constant velocity joints | Tighten the bolts, as required. Refer to Propeller Shaft Replacement . | ||||||||
Worn propeller shaft constant velocity joints | 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 of 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 of noise. | ||||||||
Worn universal joints | Replace the universal joints, as required. A worn universal joint may create a clicking or snapping type of noise. | ||||||||
Worn axle shaft constant velocity joints | Replace/repair the constant velocity joints, as required. A worn axle constant velocity joint may create a clicking, grinding, or snapping type of noise. | ||||||||
Rear axle noise | Refer to Diagnostic Starting Point - Transfer Case . | ||||||||
Loose mounting bracket | Tighten the bracket bolt or replace the bracket, as required. | ||||||||
Loose transfer case-to-transmission mounting bolts | Tighten the bolts, as required. | ||||||||
Incorrect gear oil | Replace with GM gear oil Saturn P/N 12378514. | ||||||||
Bearing noise within the transfer case | A grinding or roar type noise will increase or decrease relative to the vehicle speed.
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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:
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