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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 52 (Transfer Case - NVG 149-NP3 - Overhaul) >> Repair Instructions >> Cleaning and Inspection >> Front Case Half

Front Case Half

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  1. Clean the front case half in cleaning solvent and air dry.
    2. NOTE: Refer to Machined Surface Damage Notice .
  2. Remove the sealer from the case sealing surfaces.
  3. Inspect the case for being broken or cracked.
    Fig 1: Identifying Front Case Half Inspection Areas
    GM805636Courtesy of GENERAL MOTORS CORP.
  4. Inspect the front output shaft front bearing bore (3) for the following conditions:
    • Spun bearing
    • Cracks
  5. Inspect the input shaft bearing bore (5) for the following conditions:
    • Spun bearing
    • Cracks
  6. Replace the front case half if any of the above conditions are found.
  7. Inspect the sealing surfaces (1) for damage.
  8. Repair small scratches or nicks with a soft stone.
  9. Inspect the front case to transmission case mounting surface for damage.
  10. Inspect the case threaded bolt holes (4) for damage.
  11. Repair any damaged threads.
  12. Inspect the transmission to transfer case studs (2) for damage.
  13. Replace any damaged studs. Refer to Transfer Case Assemble .
  14. Inspect the location pins for being loose or missing.
  15. Repair or replace any damaged location pins.
  16. Inspect the front output shaft front bearing and the input shaft bearing for the following conditions:
    • Roughness
    • Brinelling
    • Pitting
  17. Replace the bearings if any of the above conditions are found. Refer to Transfer Case Disassemble and Transfer Case Assemble .
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