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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Automatic Transmission - 6T40 (MNH MNK) Or 6T45 (MHG) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Transmission Replacement (Front Wheel Drive With Diesel Engine) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Remove the battery tray. Battery Tray Replacement
  2. Remove the transmission range select lever cable from the transmission, then position out of the way.
  3. Drain the transmission fluid, if necessary. Transmission Fluid Drain and Fill 
    4. Fig 1: Control Valve Body Transmission Control Module Electrical Connector
    GM4575898Courtesy of GENERAL MOTORS COMPANY
  4. Disconnect the control valve body transmission control module (TCM) electrical connector (1) then unclip the connector from the transmission.
    5. Fig 2: Water Pump Fastener And Water Pump
    GM4576140Courtesy of GENERAL MOTORS COMPANY
  5. Remove the water pump fastener (1), then position the water pump (2) out of the way.
  6. Remove the transmission fluid cooler inlet and outlet hoses from the transmission, then position the hoses out of the way. Transmission Fluid Cooler Inlet and Outlet Pipe Replacement (MNH, MHG)
  7. Plug and/or cap the hose and transmission to prevent contamination.
    8. Fig 3: Upper Transmission To Engine Bolts
    GM4665893Courtesy of GENERAL MOTORS COMPANY
  8. Remove the upper transmission to engine bolts (1, 2, 3).
  9. Remove the drivetrain and front suspension cradle. Drivetrain and Front Suspension Cradle Replacement (All Wheel Drive)
  10. Remove the warm up three-way catalytic converter from the engine. Warm Up Three-Way Catalytic Converter Replacement (LYX)Warm Up Three-Way Catalytic Converter Replacement (LTG)
  11. Disconnect the left wheel drive shaft from the transmission. Front Wheel Drive Half Shaft Replacement - Left Side
  12. Disconnect the right wheel drive shaft from the transmission. Front Wheel Drive Half Shaft Replacement - Right Side (AWD)Front Wheel Drive Half Shaft Replacement - Right Side (M3U, MHG, MNH, MNK with FWD)Front Wheel Drive Half Shaft Replacement - Right Side (M3D, M3H with FWD)
  13. Remove the starter. Starter Replacement (LYX - All Wheel Drive)Starter Replacement (LTG - All Wheel Drive)Starter Replacement (LH7 - All Wheel Drive)
  14. Mark the relationship of the flywheel to the torque converter for reassembly.
    15. Fig 4: Torque Converter To Flywheel Bolts
    GM4576099Courtesy of GENERAL MOTORS COMPANY
  15. Remove the torque converter to flywheel bolts (1).
  16. Lower the vehicle.
  17. Remove the three left transmission mount bolts from the transmission. Transmission Mount Replacement - Left Side 
  18. Lower the transmission side with the support fixture to allow clearance for removal.
  19. Unclip the engine wiring harness from the transmission.
  20. Raise the vehicle.
  21. Use a transmission jack in order to support the transmission.
    22. Fig 5: Front Transmission Fasteners
    GM4728678Courtesy of GENERAL MOTORS COMPANY
  22. Remove the front transmission fasteners (1, 2, 3).
    23. Fig 6: Rear Transmission Fasteners
    GM4728700Courtesy of GENERAL MOTORS COMPANY
  23. Remove the rear transmission fasteners (1, 2).
  24. Remove the torque converter cover (4).
    25. NOTE:

    Ensure the torque converter remains securely in place on the transmission input shaft while separating and removing the transmission.

  25. Separate the transmission from the engine.
  26. Lower the transmission with the transmission jack far enough to remove the transmission.
  27. Flush and flow test the transmission oil cooler and lines. Transmission Fluid Cooler Flow Test and Flushing
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