GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

DEFINITION: When in the 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. 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 Two/Four Wheel Drive Shift Components Cleaning and Inspection .
  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 .