Transfer Case Whine or Rumble Noise

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. 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 rumbling noise in the transfer case. Review the Symptoms - Transfer Case and perform the necessary inspections.
Faulty bearings	Inspect all of the bearings and journals. Refer to Rear Output Shaft Cleaning and Inspection , Front Output Shaft and Input Shaft Cleaning and Inspection , and Drive Chain, Drive Sprocket, and Driven Sprocket Cleaning and Inspection . Replace any faulty bearings and any components with faulty bearing journals. Refer to Transfer Case Disassemble and Transfer Case Assemble .