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Noisy When Coasting

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Noisy When Coasting

Cause Correction
IMPORTANT: Inspect for the proper gear oil levels prior to performing system diagnosis. Refer to Lubricant Level Inspection - Rear Drive Axle .
Worn axle shaft constant velocity joints Replace the constant velocity joints as required.
Worn, loose, or damaged axle mount and/or bracket Repair or replace the axle mount and/or bracket as required.
Bearing noise within the differential assembly A grinding or roar type noise will increase or decrease relative to the vehicle speed.
  1. Inspect for the proper fluid level. Fill as required.
  2. If the noise continues, repair or replace the unit as required.
Gear set whine noise within the differential assembly A whine type noise will increase or decrease relative to the vehicle speed, approximately 31-37 km/h (50-60 mph). Typical causes of a gear set whine type noise may include incorrect backlash and/or pinion depth adjustment or worn or scored gear set teeth.
  1. Inspect for the proper fluid level. Fill as required.
  2. Repair or replace the unit as required.
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