Pinpoint Test Ac: Transfer Case Whine - Noise At All Ranges

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions
- CHECK that the transfer case is filled to the correct level and with the specified fluid. REFER to: Transfer Case Draining and Filling .
- CONFIRM that the tires and wheels are correct for the vehicle. CHECK that the tire inflation pressures are correct.
Possible Sources
- Incorrect fluid level or fluid quality
- Worn oil pump
- Internal components of the transfer case
- Under-inflated or oversized tires
Diagnostic steps are not provided for this symptom or DTC. REFER to: Diagnostic Methods