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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Transmission >> Transfer Case - BW 4484 >> Diagnostic Information and Procedures >> Transfer Case Clunk in 4LO Lock

Transfer Case Clunk in 4LO Lock

Cause Correction
DEFINITION: During acceleration or deceleration, a clunk is heard or felt in the transfer case while in 4LO Lock range only.
Review the Symptoms - Transfer Case  and perform the necessary inspections.
High/low planetary carrier assembly
  1. Inspect for the following conditions:
    • Excessively worn planetary gears
    • The planetary gears loose in the planetary carrier
    • The input gear for missing thrust washers or excessive thrust end play in the carrier
    • Excessively worn range sleeve engagement teeth on the carrier

      Refer to Transfer Case Cleaning and Inspection  .

  2. Replace the high/low planetary if any of the above conditions are found. Refer to Transfer Case Disassemble  and Transfer Case Assemble .
Annulus gear
  1. Inspect the annulus gear to front case fit for excessive looseness.
  2. Inspect the front case for wear caused by excessive looseness.
  3. Replace the front case half if it is worn.
Range sleeve
  1. Inspect the range sleeve engagement teeth for excessive wear.
  2. Inspect the range sleeve to mainshaft splines for excessive wear.
  3. Replace the range sleeve if it is faulty. Refer to Transfer Case Disassemble  and Transfer Case Assemble .
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