Intermittent Noise
| Cause | Correction |
|---|---|
| Inspect for the proper transaxle and gear oil levels prior to performing system diagnosis. Refer to Transfer Case Fluid Drain and Fill . | |
| Loose propeller shaft mounting bolts | Tighten the bolts as required. Refer to Propeller Shaft Replacement . |
| Incorrect gear oil | Replace with GM P/N 12378261 (Canadian P/N 10953455). |
Intermittent Noise
Constant Noise
| Cause | Correction |
|---|---|
| Inspect for the proper transaxle and gear oil levels prior to performing system diagnosis. Refer to Transfer Case Fluid Drain and Fill . | |
| Low gear oil levels | Faulty oil seals or other type of external leaks may contribute to lower than required fluid levels. Refer to Transfer Case Leak Diagnosis . Fill the oil to the proper level with GM P/N 12378261 (Canadian P/N 10953455). |
| Worn propeller shaft universal joints | Repair the propeller shaft, as required. Refer to Propeller Shaft Replacement . |
| Worn or loose propeller shaft center support bearing | Replace components, as required. Refer to Propeller Shaft Replacement . |
| Bearing noise within the transfer case A grinding or roar type noise will increase or decrease relative to the vehicle speed. | Inspect for the proper fluid level and fill, as required. If the noise continues, replace the transfer case, as required. |
| Gear set whine noise within the transfer case A whine type noise will increase or decrease relative to the vehicle speed. | Inspect for the proper fluid level and fill, as required. If the noise continues, replace the transfer case, as required. Contributing factors may include: Incorrect backlash between the gear set Worn or damaged gear teeth Transaxle assembly noise Rear differential noise |
Constant Noise