Cause | Correction | ||||||||
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Inspect for the proper transaxle and gear oil levels prior to performing system diagnosis. Refer to Transfer Case Fluid Replacement . | |||||||||
Low gear oil levels | Faulty oil seals or other type external leaks may contribute to lower than required fluid levels. Refer to Transfer Case Leak Diagnosis . Fill to proper level with gear oil GM P/N 12378514 (Canadian P/N 88901045). | ||||||||
Worn propeller shaft constant velocity joints | Replace the propeller shaft assembly. Refer to Propeller Shaft Replacement in Propeller Shaft. | ||||||||
Worn bearing in the rear differential torque tube assembly | Replace the torque tube assembly. | ||||||||
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 A "whine" type noise will increase or decrease relative to the vehicle speed, approximately 50-60 mph. |
Contributing factors may include:
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