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Noisy When Coasting

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. 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. Refer to Lubricant Change .
A light "clunk" type noise during a downshift is to be considered a normal condition.
Loose propeller shaft mounting bolts 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.
Worn axle shaft constant velocity joints Replace the constant velocity joints as required.
Worn, loose, or missing differential mounts Repair or replace the differential mounts as required.
Loose torque tube bracket or a damaged bracket bushing Tighten the bracket bolts or replace the bracket as required.
Worn bearing in the torque tube assembly Replace the torque tube assembly.
Bearing noise within the differential assembly
A "grinding" or "roar" type noise will increase or decrease relative to the vehicle speed.
  1. Check for the proper fluid level. Fill as required.
  2. If the noise continues, replace 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 80-97 km/h (50-60 mph).
  1. Check for the proper fluid level. Fill as required.
  2. Replace unit as required.
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