Inspect for the proper transaxle and gear oil levels prior to performing system diagnosis. Refer to Transfer Case Fluid Replacement .

Loose propeller shaft mounting bolts

Tighten the bolts, as required. Refer to Fastener Tightening Specifications .

Worn propeller shaft constant velocity joints

Replace the propeller shaft assembly. Refer to Propeller Shaft Replacement .

Worn axle shaft constant velocity joints

Replace the constant velocity joints, as required.

Loose rear differential torque tube bracket or a damaged bracket bushing

Tighten the bracket bolts or replace the bracket, as required.

Worn bearing in the rear axle torque tube assembly

Replace the torque tube assembly.

Incorrect gear oil in the transfer case

Replace the gear oil. Refer to Adhesives, Fluids, Lubricants, and Sealers .

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

Whine type noises 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