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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1884 (Transfer Case - NVG 900) >> Diagnostic Information and Procedures >> Constant Noise

Constant Noise

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
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 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.

    Contributing factors may include:

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