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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1153 (Front Drive Axle) >> Diagnostic Information and Procedures >> Constant Noise

Constant Noise

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Cause Correction
IMPORTANT: Inspect for the proper gear oil levels prior to performing system diagnosis. Refer to Front Axle Lubricant Level Inspection .
Low gear oil levels Faulty oil seals or other type leaks may contribute to lower than required fluid levels. Refer to Front Axle Lubricant Leak Diagnosis .
Fill to the proper level with the correct gear oil. Refer to Sealers, Adhesives, and Lubricants  and Front Axle Lubricant Level Inspection .
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. Check for the proper fluid level. Fill as required.
  2. If the noise continues, replace the carrier unit. Refer to Differential Carrier Assembly Replacement .
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. Check for the proper fluid level. Fill as required.
  2. Replace the carrier unit. Refer to Differential Carrier Assembly Replacement .
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