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

1. 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 .
2. Replace any faulty bearings, and any components with faulty bearing journals. Refer to Transfer Case Disassemble and Transfer Case Assemble .