Transfer Case Growl or Grinding Noise

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. 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 noise in the transfer case. Review the Symptoms - Transfer Case and perform the necessary inspections.
Faulty planetary gears	Replace the planetary carrier if any faulty gears are found. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transmission, Transaxle Unit Repair Manual. Replace the front case if the annulus gear is faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transmission, Transaxle Unit Repair Manual. Replace the input gear if it is faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transmission, Transaxle Unit Repair Manual.

Cause

Correction

DEFINITION: A faulty internal transfer case component that causes a noise in the transfer case.
Review the Symptoms - Transfer Case and perform the necessary inspections.

Faulty planetary gears

Replace the planetary carrier if any faulty gears are found. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transmission, Transaxle Unit Repair Manual.
Replace the front case if the annulus gear is faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transmission, Transaxle Unit Repair Manual.
Replace the input gear if it is faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transmission, Transaxle Unit Repair Manual.