GM Service Manual Online
For 1990-2009 cars only

Cause

Correction

DEFINITION: While shifting from HI range to LO range, there is gear clashing or the gear range cannot be selected.

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

Actuator lever

    • Inspect the actuator lever at the shift fork cam for being worn. Refer to Transfer Case Cleaning and Inspection.
    • Replace the actuator lever if found faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble.

High/low range shift fork

  1. Inspect the high/low shift fork for the following conditions:
  2. • Worn shift fork pads
    • The roller on the shift fork for wear or damage
    • Cracked or bent shift fork
    • Shift fork springs and brackets for damage
  3. Replace the following components if found faulty:
  4. • Shift fork pads
    • Shift fork

Range sleeve

  1. Inspect the range sleeve for the following conditions:
  2. • Engagement teeth for burrs or damage
    • Sliding freely on the rear output shaft
    • The range sleeve shift fork collar for excessive wear
  3. Replace the range sleeve if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble.

High/low planetary carrier

  1. Inspect the engagement teeth for burrs or damage. Refer to Transfer Case Cleaning and Inspection.
  2. Replace the high/low planetary if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble.

Front input shaft pilot bearing

  1. Inspect for the following conditions:
  2. • Failed front input shaft pilot bearing
    • Journal on the rear output shaft for excessive wear or damage
  3. Replace the bearing if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble.
  4. Replace the rear output shaft if damaged. Refer to Transfer Case Disassemble and Transfer Case Assemble.