For 1990-2009 cars

Cause | Correction
--- | ---
Inspect for the proper transaxle and gear oil levels prior to performing system diagnosis. Refer to Transfer Case Fluid Replacement .
Low gear oil levels | Faulty oil seals or other type of external leaks may contribute to lower than required fluid levels. Refer to Transfer Case Leak Diagnosis . Fill to proper level with gear oil. Refer to Adhesives, Fluids, Lubricants, and Sealers .
Worn propeller shaft constant velocity joints | Replace the propeller shaft assembly. Refer to Propeller Shaft Replacement .
Worn bearing in the rear differential torque tube assembly | Replace the torque tube assembly.
Bearing noise within the transfer case 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 internal components, as required.

Gear set whine noise within the transfer case A whine 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 internal components, as required.

Contributing factors may include:

• | Incorrect backlash between the gear sets

• | Worn or damaged gear teeth

• | Transaxle assembly noise

• | Rear differential noise