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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 53 (Transfer Case - NVG 246-NP8 - Overhaul) >> Repair Instructions >> Cleaning and Inspection >> Shift System Components

Shift System Components

WARNING: This page is about a different variant/trim than selected.
  1. Clean the following shift system components in cleaning solvent and air dry:
    Fig 1: Identifying Shift System Components
    GM1578775Courtesy of GENERAL MOTORS CORP.
    • The high/low shift fork (1)
    • The range sleeve (2)
    • The clutch lever (3)
    • The shift fork shaft (4)
    • The control actuator lever shaft (5)
    • The Vespel® pads (6)
  2. Inspect the shift fork shaft for straightness (4).
  3. Replace the shift fork shaft if it is not straight.
  4. Inspect the pads (2) on the shift fork for wear or breakage.
    Fig 2: Inspecting Shift Fork Pads
    GM1578776Courtesy of GENERAL MOTORS CORP.
  5. Replace the pads if worn or broken.
  6. Inspect the roller (1) on the shift fork for wear or damage.
  7. Replace the shift fork if the roller is faulty.
    8. IMPORTANT: Do not disassemble the shift fork. Replace as an assembly only.
    Fig 3: Identifying Shift Fork Assembly Inspection Areas
    GM801268Courtesy of GENERAL MOTORS CORP.
  8. Inspect the following components of the shift fork assembly for wear or damage:
    • The bushing (1)
    • The springs (2)
    • The washer (3)
    • The outer bracket (4)
    • The shift fork (5)
    • The inner bracket (6)
  9. Replace the shift fork assembly if any of the above components are faulty.
  10. Inspect the clutch lever roller (2) for the following conditions:
    Fig 4: Identifying Clutch Lever Assembly Inspection Areas
    GM801270Courtesy of GENERAL MOTORS CORP.
    • Wear
    • Rotating smoothly
  11. Inspect the clutch lever for worn wear pads (1).
  12. Inspect the clutch lever for wear at the pivot pin holes (3).
  13. Replace the clutch lever if the above conditions are found.
  14. Inspect the range sleeve for chipped or excessively worn teeth (1).
    Fig 5: Identifying Inspection Areas On Range Sleeve
    GM801271Courtesy of GENERAL MOTORS CORP.
  15. Inspect the shift fork collar (2) on the range sleeve for wear.
  16. Inspect the inner splines (3) of the range sleeve for excessive looseness on the rear output shaft.
  17. Replace the range sleeve if the above conditions are found.
  18. Inspect the shift fork roller slot (1) on the control actuator lever shaft for excessive wear or roughness.
    Fig 6: Identifying Control Actuator Lever Shaft Inspection Areas
    GM857324Courtesy of GENERAL MOTORS CORP.
  19. Inspect the bearing (2) and the seal surface on the control actuator lever shaft for the following conditions:
    • Pitted
    • Wear
    • Corrosion
  20. Inspect the clutch lever cam lobes (3) on the control actuator lever shaft for excessive wear or roughness.
  21. Replace the control actuator lever shaft if any of the above conditions are found.
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