Transfer Case Grating Noise

WARNING: This page is about a different car, the 2009 GMC Yukon, 2009 Chevrolet Tahoe, 2009 Chevrolet Suburban, and 2009 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 grating noise in the transfer case while in the AWD, 4HI, or 4LO mode. Review the Symptoms - Transfer Case and perform the necessary inspections.
Broken clutch apply plate	Inspect for a broken clutch apply plate. Refer to Transfer Case Disassemble and Transfer Case Assemble . Replace the apply plate and the transfer case components that are damaged from debris. Refer to Transfer Case Disassemble and Transfer Case Assemble .
Faulty control actuator lever thrust bearings	Inspect for faulty control actuator lever thrust bearings. Refer to Two/Four Wheel Drive Shift Components Cleaning and Inspection . Recondition the transfer case components that are damaged from debris. Refer to Transfer Case Disassemble and Transfer Case Assemble .