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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 >> Transmission Case Cleaning and Inspection

Transmission Case Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.
  1. Clean the transmission case in cleaning solvent, and air dry.
    2. NOTE: Refer to Machined Surface Damage Notice .
  2. Remove the sealer from the case sealing surface.
  3. Inspect the front countershaft bearing (5) for:
    • Roughness
    • Brinneling
    • Pitting
    Fig 1: Inspecting Transmission Case
    GM789439Courtesy of GENERAL MOTORS CORP.
  4. Replace the front countershaft bearing if any of the above conditions are found.
  5. Inspect the case for being broken or cracked.
  6. Replace the case if it is broken or cracked.
  7. Inspect the sealing surfaces (3) for damage.
  8. Repair small scratches or nicks with a soft stone.
  9. Inspect the extension mounting (4) for damage.
  10. Replace the case if the mounting is damaged.
  11. Inspect the case threaded bolt holes (1) for damage.
  12. Repair any damaged threads.
  13. Inspect for missing or loose location pins (2).
  14. Repair or replace any damaged dowel pins.
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