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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 55 (Manual Transmission - NV 4500 - Overhaul) >> Repair Instructions >> Front and Rear Housings Cleaning and Inspection

Front and Rear Housings Cleaning and Inspection

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  1. Clean the transmission extension in cleaning solvent, and air dry.
  2. Remove the sealer from the case sealing surface.
  3. Inspect the rear output bearing (3) for:
    • Roughness
    • Brinneling
    • Pitting
    Fig 1: Inspecting Transmission Housing
    GM789434Courtesy of GENERAL MOTORS CORP.
  4. Replace the rear output bearing if any of the above conditions are found. Refer to Transmission Extension Disassemble .
  5. Inspect the case for being broken or cracked.
  6. Replace the case if it is broken or cracked.
  7. Inspect the sealing surfaces (2) for damage.
  8. Repair small scratches or nicks with a soft stone.
  9. Inspect the extension mounting for damage.
  10. Replace the extension if the mounting is damaged.
  11. Inspect the case threaded bolt holes for damage.
  12. Repair any damaged threads.
  13. Inspect for missing or loose location pins (1).
  14. Repair or replace any damaged dowel pins.