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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1591 (Transfer Case - NVG 900) >> Diagnostic Information and Procedures >> Noisy When Coasting

Noisy When Coasting

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.
Noisy When Coasting

Cause Correction
Inspect for the proper gear oil levels prior to performing system diagnosis.
Loose propeller shaft mounting bolts. Tighten the bolts, as required. Refer to Propeller Shaft Replacement .
Worn propeller shaft constant velocity joint Replace the propeller shaft assembly. Refer to Propeller Shaft Replacement .
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 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.
Rear axle noise Refer to Diagnostic Starting Point - Rear Drive Axle .
Loose mounting bracket Tighten the bracket bolts 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.
  • Inspect for proper fluid level and 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. 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 the gear sets
    • Worn or damaged gear teeth
    • Transaxle assembly noise
    • Rear axle noise