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Constant Noise

Constant Noise


Cause Correction
Inspect for the proper transaxle and gear oil levels prior to performing system diagnosis.
Low gear oil level Inspect the transfer case for leaks, repair as required. Refer to Transfer Case Leak Diagnosis and Adhesives, Fluids, Lubricants, and Sealers .
Incorrect gear oil in the transfer case Replace the gear oil. Refer to Adhesives, Fluids, Lubricants, and Sealers .
Worn propeller shaft constant velocity joints Replace propeller shaft assembly. Refer to Propeller Shaft Replacement .
Worn bearing in the differential assembly Repair or replace the assembly as required.
Bearing noise within the transfer case
A grinding noise that occurs at a specific engine speed, regardless of transmission gear, is not within the transfer case.

A grinding noise that changes as a transmission shift occurs is not within the transfer case.

A grinding noise that changes as vehicle speed changes may be also caused by worn wheel bearings.

A grinding noise that changes as the vehicle turns may also be caused by worn wheel bearings and/or tires.



1. Inspect for the proper fluid level. Fill, as required.

2. Identify the location of the noise using the J 39570 Chassis Ears.

3. If the noise continues, repair or replace components, as required.


Gear set whine noise within the transfer case
A whine noise that occurs at a specific engine speed, regardless of transmission gear, is not within the transfer case.

A whine noise that changes as a transmission shift occurs is not within the transfer case.

A whine noise that changes as vehicle speed changes may be also caused by worn wheel bearings.

A whine noise that changes as the vehicle turns may also be caused by worn wheel bearings and/or tires.



1. Inspect for the proper fluid level. Fill, as required.

2. Identify the location of the noise using the J 39570 Chassis Ears.

3. If the noise continues, repair or replace components, as required.