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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1767 (Transfer Case - NVG 900) >> Diagnostic Information and Procedures >> Noisy in Drive

Noisy in Drive

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Noisy in Drive

Cause Correction
Inspect for the proper gear oil levels prior to performing system diagnosis.
Loose propeller shaft constant velocity joints Tighten the bolts as required. Refer to Propeller Shaft Replacement in Propeller Shaft.
Worn propeller shaft constant velocity joints Replace the 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 of 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 of noise.
Worn universal joints Replace the universal joints as required.
A worn universal joint may create a clicking or snapping type of noise.
Worn axle shaft constant velocity joints Replace/repair the constant velocity joints as required.
A worn axle constant velocity joint may create a clicking, grinding, or snapping type of noise.
Rear axle noise Refer to Diagnostic Starting Point - Transfer Case .
Loose mounting bracket Tighten the bracket bolt or replace the bracket as required.
Loose transfer case-to-transmission mounting bolts Tighten the bolts as required.
Incorrect gear oil Replace with GM gear oil Saturn P/N 12378514.
Bearing noise within the transfer case A grinding or roar type noise will increase or decrease relative to the vehicle speed.
  • Check for proper fluid level. Fill as required.
  • If the noise continues, replace the unit.
Gear set whine noise within the transfer case Whine type noises will increase or decrease relative to the vehicle speed, approximately 80-90 km/h (50-60 mph).
  1. Check for the proper fluid level. Fill as required.
  2. If the noise continues, repair or replace the internal components as required.

    Contributing factors may include:

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