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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) >> Installation Procedure

Installation 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.
    WARNING:

    Use care when cleaning the clutch hub. The clutch hub may have sharp edges and can cause personal injury if contact is made. Wear protective gloves to avoid personal injury.

  1. Clean the clutch hub and the input shaft from any debris and contaminates with a lint-free towel.
  2. Fig 1: Applying Light Coating Of Multi-Purpose Grease
    GM2665890Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Applying too much or the wrong type of grease on the transmission input shaft may cause damage, clutch slippage or failure. Always apply the correct type of grease. Never apply more grease than is necessary to coat the transmission input shaft with a very thin film of grease.

  3. Use a clean flat brush (1) to apply very light coating of multi-purpose grease to input shaft until the metal is only shiny. No visible clumps of grease are permissible regardless of size. Smear away from the transmission in direction of the shown arrow.
  4. Fig 2: Cleaning Lead Surface Of Input Shaft With Lint-Free Towel
    GM2665891Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Ensure that no grease remains on the lead surface of the transmission input shaft. Clean the lead surface of the transmission input shaft prior to the assembly of the transmission to the engine. Failure to maintain a clean surface may cause clutch slippage or failure.

  5. Clean the entire lead surface of the input shaft with a NEW, lint-free towel (1).
  6. With the cradle in the lowered position, fit the transmission to the vehicle. It may be necessary to push up on the front of the engine to gain enough clearance to the body structure.
  7. Fig 3: Left Lower Transmission Clutch Housing To Engine Fasteners
    GM2840624Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Fastener Caution .

  8. Install the two left lower transmission clutch housing to engine fasteners (1) and tighten to 50 N.m (37 lb ft).
  9. Fig 4: Lower Transmission Clutch Housing To Engine Fasteners (Transmission Side)
    GM2840592Courtesy of GENERAL MOTORS COMPANY
  10. Install the two right (transmission side) lower transmission clutch housing to engine fasteners (1) and tighten to 50 N.m (37 lb ft).
  11. Fig 5: Upper Transmission Clutch Housing To Engine Fasteners
    GM2840554Courtesy of GENERAL MOTORS COMPANY
  12. Install the upper transmission clutch housing to engine bolts and studs (1) and tighten to 50 N.m (37 lb ft).
  13. Install the three harness retainers to the upper clutch housing to engine fasteners.
  14. Fig 6: Lower Slave Cylinder Hose/Pipe And Retaining Clip
    GM4162851Courtesy of GENERAL MOTORS COMPANY
  15. Connect the lower slave cylinder hose (2) to the slave cylinder.
  16. Install the hydraulic clutch hose/pipe retaining clip (1) to the clutch slave cylinder.
  17. Connect the shift control assembly to the transmission. Refer to Shift Control Assembly Replacement (M3L) 
  18. Tilt engine and transmission up and tighten all cradle bolts. Refer to Drivetrain and Front Suspension Frame Removal and Installation (LGX, LTG)
  19. Install the transmission mount. Refer to Transmission Rear Mount Replacement 
  20. Fig 7: Frame Brace & Fasteners (RWD)
    GM3749726Courtesy of GENERAL MOTORS COMPANY
  21. Install the frame braces (3) to the vehicle. Refer to Drivetrain and Front Suspension Frame Removal and Installation (LGX, LTG)
  22. Fig 8: Backup Lamp Switch And Vehicle Speed Sensor Electrical Connectors
    GM2838600Courtesy of GENERAL MOTORS COMPANY
  23. Connect the wiring harness to the transmission then connect the following electrical connectors:
    • Backup lamp switch (1)
    • Vehicle speed sensor (2)
    • Fig 9: Fluid Temperature Sensor
      GM4038894Courtesy of GENERAL MOTORS COMPANY
    • Connect the fluid temperature sensor connector (2).
  24. Install the oil flow control valve heat shield. Refer to Oil Pump Flow Control Valve Heat Shield Replacement
  25. Install the catalytic converter. Refer to Catalytic Converter Replacement (LCV)Catalytic Converter Replacement (LTG)
  26. Fig 10: Charge Air Cooler Outlet Air Tube And Throttle Body
    GM2869954Courtesy of GENERAL MOTORS COMPANY
  27. Connect the charge air cooler outlet tube (1) to the throttle body (2). Refer to Charge Air Cooler Outlet Air Tube Replacement (LTG)
  28. Bleed to hydraulic clutch system. Refer to Hydraulic Clutch System Bleeding
  29. Check the transmission fluid and fill as necessary. Refer to Transmission Fluid Level Inspection (M3L)