Intermittent Noise
| Cause | Correction |
|---|---|
| Inspect for 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. |
| Loose mounting bracket | Tighten the bracket bolts or replace the bracket as required. |
| Loose transfer case-to-transaxle mounting bolts | Tighten the mounting bolts as required. |
Intermittent Noise
Constant Noise
| Cause | Correction |
|---|---|
| Inspect for proper gear oil levels prior to performing system diagnosis. | |
| Low gear oil levels | Faulty oil seals or other type leaks may contribute to lower than required fluid levels. Fill to the proper level with GM gear oil Saturn P/N 12368514. |
| Worn propeller shaft constant velocity joint | Replace 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. |
| Bearing noise within transfer case | A grinding or roar type noise will increase or decrease relative to vehicle speed. Check for proper fluid level. Fill as required. If the noise continues, repair or replace the unit. |
| Gear set whine noise within carrier assembly | A whine type noise will increase or decrease relative to vehicle speed, approximately 80-90 km/h (50-60 mph). Check for proper fluid level. Fill as required. If the noise continues, repair or replace the internal components as required. Contributing factors may include: Incorrect backlash between gear sets Worn or damaged gear teeth Transaxle assembly noise Rear axle noise |
Constant Noise