Transfer Case Grating Noise

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet 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 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 .