Transfer Case Clunk during Acceleration and Deceleration

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Cause	Correction
DEFINITION: During acceleration or deceleration, a clunk is heard or felt in the transfer case. 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 . Inspect the transfer case for the correct type of fluid. Flush the transfer case, and fill with the correct fluid, if required. Refer to Approximate Fluid Capacities .
Worn or loose chain	Inspect for a loose chain, excessive wear on the snubber or deep gouges in the lining. Replace the chain, sprockets, and snubber. Refer to Transfer Case Disassemble and Transfer Case Assemble .