GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

DEFINITION: A shudder, binding, or a crop-hop while turning, which may cause tire scuffing.

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

Planetary differential

  1. Inspect the planetary differential pinion gears for the following conditions:
  2. • Chipped, bent or deformed teeth
    • Pinion gear bushings worn
    • Pinion gear thrust washers missing
    • Seized or binding pinion gears
    • Refer to Transfer Case Cleaning and Inspection in Transfer Case - BW 4476/79 Unit Repair.
  3. Inspect the planetary differential for deformation. Refer to Transfer Case Cleaning and Inspection in Transfer Case - BW 4476/79 Unit Repair.
  4. Replace the planetary differential assembly if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4476/79 Unit Repair.

Thrust washer

  1. Inspect the thrust washer for seizure to the planetary differential.
  2. Replace the thrust washer if faulty and the mating component if damaged. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4476/79 Unit Repair.

Planetary differential not timed properly

  1. Inspect the planetary differential for being timed properly. Refer to Transfer Case Assemble in Transfer Case - BW 4476/79 Unit Repair.
  2. Properly time the planetary differential gears. Refer to Transfer Case Assemble in Transfer Case - BW 4476/79 Unit Repair.