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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 - On Vehicle >> Transmission Replacement (M3L) >> Removal Procedure

Removal Procedure

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: Charge Air Cooler Outlet Air Tube And Throttle Body
    GM2869954Courtesy of GENERAL MOTORS COMPANY
  1. Disconnect the charge air cooler outlet tube (1) from the throttle body (2). Refer to Charge Air Cooler Outlet Air Tube Replacement (LTG)
  2. Remove the catalytic converter. Refer to Catalytic Converter Replacement (LCV)Catalytic Converter Replacement (LTG)
  3. Remove the oil flow control valve heat shield. Refer to Oil Pump Flow Control Valve Heat Shield Replacement
    4. NOTE:

    Transmission jack is installed to transmission in this step.

  4. Disconnect the shift control assembly from the transmission. Refer to Shift Control Assembly Replacement (M3L) 
    5. Fig 2: Frame Brace & Fasteners (RWD)
    GM3749726Courtesy of GENERAL MOTORS COMPANY
  5. Remove the frame braces (3) from the vehicle. Refer to Drivetrain and Front Suspension Frame Removal and Installation (LGX, LTG)
    6. Fig 3: Backup Lamp Switch And Vehicle Speed Sensor Electrical Connectors
    GM2838600Courtesy of GENERAL MOTORS COMPANY
  6. Disconnect the wiring harness from the transmission then disconnect the following electrical connectors:
    • Backup lamp switch (1)
    • Vehicle speed sensor (2)
      Fig 4: Fluid Temperature Sensor
      GM4038894Courtesy of GENERAL MOTORS COMPANY
    • Disconnect the fluid temperature sensor connector (2).
    7. Fig 5: Lower Slave Cylinder Hose/Pipe And Retaining Clip
    GM4162851Courtesy of GENERAL MOTORS COMPANY
  7. Remove the hydraulic clutch hose/pipe (1) retaining clip from the clutch slave cylinder.
  8. Disconnect the hydraulic clutch hose/pipe (2) from the clutch slave cylinder. Plug the lower hose end.
  9. Remove the two right (engine side) lower transmission clutch housing to engine fasteners.
    10. Fig 6: Lower Transmission Clutch Housing To Engine Fasteners (Transmission Side)
    GM2840592Courtesy of GENERAL MOTORS COMPANY
  10. Remove the two right (transmission side) lower transmission clutch housing to engine fasteners (1).
    11. Fig 7: Left Lower Transmission Clutch Housing To Engine Fasteners
    GM2840624Courtesy of GENERAL MOTORS COMPANY
  11. Remove the two left lower transmission clutch housing to engine fasteners (1).
    12. Fig 8: Front And Rear Cradle Bolts
    GM4162644Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Securely support the drivetrain and front suspension cradle with an adjustable jack.

  12. Loosen the front cradle bolts (1) one turn, remove the rear cradle bolts (3) completely, loosen the middle cradle bolts (2) enough to allow the rear of the cradle support to tilt down with the jack approximately 25 mm (1 in) (a).
  13. Remove the three harness retainers from the upper clutch housing to engine fasteners to access the upper transmission fasteners.
    14. Fig 9: Upper Transmission Clutch Housing To Engine Fasteners
    GM2840554Courtesy of GENERAL MOTORS COMPANY
  14. Remove the three upper transmission clutch housing to engine fasteners (1).
    15. NOTE:

    Do not leave the engine tilted on its mounts for an extended amount of time.

  15. Remove the transmission from the vehicle. To clear the body structure, the front of the engine can be pushed up to tilt the engine and transmission.
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