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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Transfer Case - NVG 263-NP1 - Service & Diagnosis) >> Diagnostic Information and Procedures >> Transfer Case Jumps Out of Gear

Transfer Case Jumps Out of Gear

WARNING: This page is about a different variant/trim than selected.
Transfer Case Jumps Out of Gear

Cause Correction
DEFINITION: Loss of the transfer case drive torque during deceleration, acceleration or under load.
Review the Symptoms - Transfer Case  and perform the necessary inspections.
Melted high/low range shift fork pads Replace the high/low range shift fork pads or other damaged components. Refer to TRANSFER CASE DISASSEMBLE and TRANSFER CASE ASSEMBLE .
Faulty high/low range shift fork
  1. Inspect the high/low range shift fork for being damaged. Refer to CLEANING AND INSPECTION .
  2. Replace the shift fork if faulty. Refer to TRANSFER CASE DISASSEMBLE and TRANSFER CASE ASSEMBLE .
Faulty high speed teeth on the range sleeve
  1. Inspect for the following conditions:
    • The input gear high speed engagement teeth for wear or damage
    • The engagement teeth on the range sleeve for wear or damage

      Refer to CLEANING AND INSPECTION .

  2. Replace the range sleeve if the teeth are faulty. Refer to TRANSFER CASE DISASSEMBLE and TRANSFER CASE ASSEMBLE .
  3. Replace the input shaft if the input gear engagement teeth are faulty. Refer to TRANSFER CASE DISASSEMBLE and TRANSFER CASE ASSEMBLE .
High/low range shift fork bushing and springs
  1. Inspect the high/low range shift fork springs for being faulty.
  2. Inspect the range fork shaft bushing for wear.

    Refer to CLEANING AND INSPECTION .

  3. Replace the high/low range shift fork if the springs or bushings are faulty. Refer to TRANSFER CASE ASSEMBLE .
High/low planetary carrier
  1. Inspect the high/low planetary carrier for the following conditions:
    • Low speed engagement teeth worn or damaged
    • Cracked carrier housing
    • Pinion gear worn or out of position
    • Pinion gears broken or damaged teeth
    • Pinion gears seized

      Refer to CLEANING AND INSPECTION .

  2. Replace the high/low planetary carrier if any of the above conditions are found. Refer to TRANSFER CASE DISASSEMBLE and TRANSFER CASE ASSEMBLE .
2/4 Wheel drive synchronizer gear
  1. Inspect the 2/4 wheel drive synchronizer gear for worn engagement teeth.
  2. Replace the synchronizer gear if faulty. Refer to TRANSFER CASE ASSEMBLE .