Transfer Case Whine or Rumble Noise

WARNING: This page is about a different car, the 2004 Oldsmobile Bravada and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.

Cause	Correction
DEFINITION: A faulty internal transfer case component that causes a whine or rumble noise in the transfer case. Review the Symptoms - Transfer Case and perform the necessary inspections.
Faulty bearings	Inspect all bearings and journals. Refer to Cleaning and Inspection in Transfer Case - NVG 126-NP4 Unit Repair. Replace any faulty bearings and any components with faulty bearing journals. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 126-NP4 Unit Repair.