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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Transfer Case - NVG 261-NP2 - Service & Troubleshooting) >> Diagnostic Information and Procedures >> Transfer Case Clunk in 4LO

Transfer Case Clunk in 4LO

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Transfer Case Clunk in 4LO

Cause Correction
DEFINITION: During acceleration or deceleration, a clunk is heard or felt in the transfer case while in 4LO 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
    • Excessively worn range collar engagement teeth on the carrier

      Refer to 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. Replace the front case half if the annulus gear is loose. Refer to TRANSFER CASE DISASSEMBLE and TRANSFER CASE ASSEMBLE .
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 faulty. Refer to TRANSFER CASE DISASSEMBLE and TRANSFER CASE ASSEMBLE .
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