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 in Propeller Shaft. |
| 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 external leaks may contribute to lower than required fluid levels. Refer to Transfer Case Leak Diagnosis . Fill to 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 in Propeller Shaft. |
| Worn or loose propeller shaft center support bearing | Replace components as required. Refer to Propeller Shaft Replacement in Propeller Shaft. |
| Bearing noise within the transfer case A "grinding" or "roar" type noise will increase or decrease relative to the vehicle speed. | Check for the proper fluid level. 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. | Check for the proper fluid level. 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