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 in Propeller Shaft. | ||||||||
Worn propeller shaft constant velocity joint | Replace the propeller shaft assembly. Refer to Propeller Shaft Replacement in Propeller Shaft. 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 | Refer to Diagnostic Starting Point - Rear Drive Axle in Rear Drive Axle. | ||||||||
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 gear oil GM P/N United States 12378514, GM P/N Canada 88901045, or equivalent. | ||||||||
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 80-97 km/h (50-60 mph).
Contributing factors may include:
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