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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 >> Transmission Assemble (MG9) >> Extension Housing Assembly Installation

Extension Housing Assembly Installation

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: Applying Sealant To Top 2 Extension Housing Bolts
    GM38712Courtesy of GENERAL MOTORS COMPANY
  1. Apply thread sealer or equivalent to the top 2 extension housing bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers (MG9) 
    2. Fig 2: Rear Extension Housing, Bolts, Nuts, Brackets And Gasket
    GM4055396Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Align the 5th/6th shift shaft to the extension housing bore in order to install the extension housing.

  2. Install the extension housing gasket (6) and the extension housing (5).
  3. Install the transmission tag bracket (3), brackets (4), bolts (1), and nuts (2). The cooler line bracket shown must be installed at an angle of 45 degrees (a) before tightening bolts.
  4. Tighten to 48 N.m (36 lb ft).
    5. Fig 3: Transmission Gap Magnet And Bolt
    GM4055395Courtesy of GENERAL MOTORS COMPANY
  5. Install the transmission gap magnet (1) and bolt (2). Tighten to 5 N.m (44 lb in)
    6. Fig 4: Gear Position Sensor, Bolt And Gasket
    GM4055394Courtesy of GENERAL MOTORS COMPANY
  6. Install the manual transmission gear position sensor gasket (3) and the manual transmission gear position sensor (2).
  7. Install the manual transmission gear position sensor bolts (1). Tighten to 8 N.m (71 lb in).
    8. Fig 5: Propeller Shaft Transmission Yoke
    GM4062705Courtesy of GENERAL MOTORS COMPANY
  8. Install the propeller shaft transmission yoke (1).
    9. Fig 6: Holding Fixture, Propeller Shaft Transmission Yoke Nut And Washer
    GM4055391Courtesy of GENERAL MOTORS COMPANY
  9. Install the propeller shaft washer (2) and nut (1).
  10. Use the J-45012  holder (3) and tighten the nut (1) to 136 N.m (100 lb ft)
    11. Fig 7: Shifter Cover Plate, Bolts And Gasket
    GM4055388Courtesy of GENERAL MOTORS COMPANY
  11. Install the shifter cover plate (2) and gasket (1).
  12. Install the shifter cover plate bolts (3) and tighten to 20 N.m (15 lb ft).
    13. Fig 8: Holding Fixture And Adapters
    GM4055387Courtesy of GENERAL MOTORS COMPANY
  13. Remove the DT-47678  flange (2) and DT-47678-10  adapter.
  14. Remove the DT-47678  flange and DT-47678-10  adapter from J-3289-20  fixture (1).
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