GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

DEFINITION: When in AWD mode, a shudder is felt during acceleration or a crow-hop or binding while turning, which may cause tire scuffing.

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

Oil breakdown or contamination

Flush the transfer case and fill with the correct fluid. Refer to Transfer Case Fluid Replacement .

Incorrect transfer case fluid

Flush the transfer case and fill with the correct fluid. The active transfer case uses a blue fluid. Refer to Transfer Case Fluid Replacement .

Burrs on the clutch hub slots

  1. Inspect the clutch disc tab slots in the clutch hub for burrs or notches. Refer to Transfer Case Cleaning and Inspection in Transfer Case - NVG 236-NP8 Unit Repair.
  2. De-burr the hub slots. If the hub slots are excessively notched, replace the clutch hub. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - NVG 236-NP8 Unit Repair.