Transfer Case Clunk in 4HI. GMC Truck Envoy XUV 2006

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2006 🢒 Envoy XUV 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Transfer Case Clunk in 4HI

Problem

Action

DEFINITION: During acceleration or deceleration, a clunk is heard or felt in the transfer case while in the 4HI range only.

Review the Symptoms - Transfer Case and perform the necessary inspections.

Incorrect fluid level or incorrect fluid

•	Inspect the transfer case for the correct fluid level. Refer to Transfer Case Fluid Replacement .

•	Fill the transfer case to the correct fluid level, if required.

•	Inspect the transfer case for the correct type of fluid.

•	Flush the transfer case and fill with the correct fluid, if required.

Worn high speed teeth on the range collar

Inspect for worn high speed teeth on the range collar. Refer to Transfer Case Cleaning and Inspection in Transfer Case - NVG 226-NP8 Unit Repair.

Worn or missing input gear thrust washers

Inspect for worn or missing input gear thrust washers. Refer to Transfer Case Cleaning and Inspection in Transfer Case - NVG 226-NP8 Unit Repair.