GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

Inspect for proper gear oil levels prior to performing system diagnosis.

Low gear oil levels

Faulty oil seals or other type of 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 .

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 or 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.

    • Inspect for proper fluid level and 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).

  1. Inspect for proper fluid level and fill, as required.
  2. If the noise continues, repair or replace the internal components as required.
  3. Contributing factors may include:

    • Incorrect backlash between gear sets
    • Worn or damaged gear teeth
    • Transaxle assembly noise
    • Rear axle noise