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Home >> Cadillac >> 2019 >> ATS Premium Performance >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Repair Instructions - On Vehicle >> Repair Instructions - On Vehicle >> Transmission Replacement (M5N with LTG) >> Installation Procedure

Installation Procedure

  1. Remove the J-21366  strap from the transmission bell housing.
  2. Install the transmission to the vehicle.
  3. GM4089977Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

    Install the transmission to engine bolts (1, 2, 3) and tighten to 58 N.m (43 lb ft).

  4. GM4089964Courtesy of GENERAL MOTORS COMPANY

    Connect the transmission vent hose (2) and retainer (1).

  5. GM4089960Courtesy of GENERAL MOTORS COMPANY

    Install the left upper transmission to engine bolts (1, 2) and tighten to 58 N.m (43 lb ft).

  6. GM4089412Courtesy of GENERAL MOTORS COMPANY

    Install the lower right transmission to engine bolt (1) and tighten to 58 N.m (43 lb ft).

  7. GM4089329Courtesy of GENERAL MOTORS COMPANY

    Install the auxiliary heater pump bracket (3) to the transmission and tighten the fastener (1) to 10 N.m (89 lb in).

  8. Install the lower right transmission to engine bolt (2) and tighten to 58 N.m (43 lb ft).
  9. GM4089733Courtesy of GENERAL MOTORS COMPANY

    Install the lower left transmission to engine bolts (1, 2) and tighten to 58 N.m (43 lb ft).

  10. Connect the electrical wiring harness retainers to the transmission to engine fasteners and to the transmission case.
  11. Install the transmission support. Transmission Support Replacement (Automatic RWD) , or Transmission Support Replacement (Automatic AWD)
  12. Remove the transmission jack from under the vehicle.
  13. Align the torque converter to flexplate orientation marks made during the removal procedure.
  14. GM4089372Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Torque converter bolts are self-locking and must be replaced with NEW torque converter bolts every time the bolts are removed.

    Complete the following steps for all torque converter bolts (1):

    1. Rotate the harmonic balancer center bolt clockwise ONLY, in order to align the torque converter bolt holes in the flexplate with the starter opening in the engine block.
    2. Install all NEW torque converter bolts (1) and tighten to 63 N.m (46 lb ft).
  15. GM4089020Courtesy of GENERAL MOTORS COMPANY

    Install the transmission close out plug (1).

  16. GM4089948Courtesy of GENERAL MOTORS COMPANY

    Install the catalytic converter shield (4) to the engine assembly and tighten the fasteners (1, 2, 3) to 10 N.m (89 lb in).

  17. Catalytic Converter Replacement - Install
  18. GM4088805Courtesy of GENERAL MOTORS COMPANY

    Install the catalytic converter bracket (2) to the transmission.

  19. Install the fasteners (1, 3) and tighten to 22 N.m (16 lb ft).
  20. GM4083607Courtesy of GENERAL MOTORS COMPANY

    Install the transmission fluid cooler inlet and outlet pipe (1) to the transmission. Transmission Fluid Cooler Inlet and Outlet Pipe Replacement (LTG With AWD, Without V03) , or Transmission Fluid Cooler Inlet and Outlet Pipe Replacement (LTG With RWD, Without V03) , or Transmission Fluid Cooler Inlet and Outlet Pipe Replacement (LTG With RWD, With V03) , or Transmission Fluid Cooler Inlet and Outlet Pipe Replacement (LTG With AWD, With V03)

  21. Connect the wiring harness retainers and connectors to the transmission.
  22. Fig 1: Identifying Transmission Range Selector Lever Cable, Terminal, Shift Lever Pin And Retainer
    GM4032383Courtesy of GENERAL MOTORS COMPANY

    Install the cable in the bracket, then slide the retainer (4) rearward to lock the transmission range selector lever cable in the bracket.

  23. Connect the transmission range selector lever cable terminal (1) to the transmission manual shift lever pin (2).
  24. Adjust the cable. Range Selector Lever Cable Adjustment 
  25. Two-Piece Propeller Shaft Replacement (LTG, LGX) - Install
  26. {If equipped} Front Axle Propeller Shaft Replacement (LGX, LTG) - Install
  27. Starter Replacement (LTG) - Install
  28. Connect the charge air cooler outlet air tube to the throttle body. Charge Air Cooler Outlet Air Tube Replacement (LTG)
  29. Check the transmission fluid level and fill if necessary. Transmission Fluid Level and Condition Check
  30. Lower the vehicle.
  31. Perform the solenoid valve characterization. Solenoid Valve Characterization Reprogramming
    32. NOTE:

    The Service Fast Learn procedure must be performed when one of the following repairs have been made to the vehicle. Failure to perform the procedure after one of the following repairs may result in poor transmission performance, as well as transmission DTCs being set:

    The service fast learn procedure must be performed when any of the following repairs has been made to the transmission.

    • Pressure regulating solenoid replacement
    • Valve body repair or replacement
    • Any service/repair in response to a shift quality concern
    • Any internal transmission service, repair, overhaul, or replacement
    • Torque converter replacement
    • TCM replacement
    • Transmission assembly replacement
  32. Perform the service fast learn procedure. Transmission Service Fast Learn Procedure 
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