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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1159 (Manual Transmission - AISIN AY6) >> Repair Instructions - Off Vehicle >> Transmission Case Cleaning and Inspection >> Middle Case

Middle Case

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Inspecting Middle Case
    GM1485510Courtesy of GENERAL MOTORS CORP.
  1. Clean the middle case in a suitable cleaning solvent and air dry.
  2. Remove the sealer from the case sealing surfaces.
  3. Inspect the case for being broken or cracked.
  4. Inspect the input shaft bearing bore for the following conditions:
    • A spun bearing
    • Cracks
  5. Inspect the countershaft front bearing bore for the following conditions:
    • A spun bearing
    • Cracks
  6. Replace the case assembly if any of the above conditions are found.
  7. Inspect the sealing surfaces for damage.
  8. Repair small scratches or nicks with a soft stone.
  9. Inspect the case threaded bolt holes for damage.
  10. Repair any damaged threads.
  11. Inspect the location pins for being loose or missing.
  12. Repair or replace any damaged location pins.