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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 198 (Manual Transmission - TREMEC 6-Speed (M3L Mg9)) >> Repair Instructions - Off Vehicle >> Extension Cleaning and Inspection (M3L)

Extension Cleaning and Inspection (M3L)

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Rear Extension Housing
    GM2773170Courtesy of GENERAL MOTORS COMPANY
  1. Clean the rear extension housing (1) in a suitable solvent. Air dry the housing.
  2. Inspect the extension housing for the following:
    • Cracks
    • Scratches
    • Damaged threads
    • Burrs
    • Nicked mounting surfaces
    • Damaged sealing surfaces
    • Damaged front or rear bearing bores
  3. Replace a cracked housing.
  4. Clean up damaged threads with the correct size thread tap.
  5. Inspect the machined mating surfaces for flatness. Check the mating surfaces with a straight edge.
  6. Use a fine mill file to dress minor scratches or burrs.