For 1990-2009 cars

Cause | Correction
--- | ---
Important: Inspect the differential oil level prior to performing system diagnosis. Refer to Rear Axle Lubricant Level Inspection .
Low differential oil level. | Faulty oil seals or other type leaks may contribute to lower than required fluid levels. Refer to Differential Oil Leak Diagnosis . Fill to the correct level with the correct differential oil. Refer to Lubrication Specifications and Rear Axle Lubricant Level Inspection .
Worn or damaged differential mount and/or mounts. | Replace the differential mount and/or mounts as required. Refer to Differential Carrier Bushing Replacement - Rear .
Gear whine within Rear Drive Axle. |

1. If oil level is correct then check the condition of the oil. Drain and fill as required.
2. If the oil is in good condition check for foreign particle contamination. Drain and fill as required.
3. If the oil is not contaminated with foreign particles then check for water contamination. Drain and fill as required.
4. If the oil is not contaminated with water, or if the noise continues, then road test the vehicle.
5. If result of the road test confirms likely Rear Drive Axle noise, then repair or replace the unit as required. If result of a road test confirms likely that noise is not related to the Rear Drive Axle, then refer to relevant component subsection for further diagnosis.

Bearing noise within Rear Drive Axle. |

1. If oil level is correct then check the condition of the oil. Drain and fill as required.
2. If the oil is in good condition check for foreign particle contamination. Drain and fill as required.
3. If the oil is not contaminated with foreign particles then check for water contamination. Drain and fill as required.
4. If the oil is not contaminated with water, or if the noise continues, then road test the vehicle.
5. If result of the road test confirms likely Rear Drive Axle noise, then repair or replace the unit as required. If result of a road test confirms likely that noise is not related to the Rear Drive Axle, then refer to relevant component subsection for further diagnosis.