Transfer Case Grating Noise

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. 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 apply plate	Inspect for a broken apply plate. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 226-NP8 Unit Repair.
Faulty clutch pressure plate bearing	Inspect for a faulty clutch pressure plate bearing. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 226-NP8 Unit Repair. Condition the transfer case components that are damaged from debris. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 226-NP8 Unit Repair.