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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 LGX) >> Removal Procedure

Removal Procedure

  1. Raise and suitably support the vehicle. Lifting and Jacking the Vehicle (ATS) .
  2. Two-Piece Propeller Shaft Replacement (LTG, LGX) - Remove
  3. {If equipped} Front Axle Propeller Shaft Replacement (LGX, LTG) - Remove
  4. GM4311500Courtesy of GENERAL MOTORS COMPANY

    Remove the cable retainer bolt (1), then remove the cable retainer.

  5. Fig 1: Identifying Transmission Range Selector Lever Cable, Terminal, Shift Lever Pin And Retainer
    GM4032383Courtesy of GENERAL MOTORS COMPANY

    Disconnect the transmission range selector lever cable terminal (1) from the transmission manual shift lever pin (6).

  6. Slide the retainer (4) forward to release the transmission range selector lever cable (5) from the bracket.
  7. GM4083607Courtesy of GENERAL MOTORS COMPANY

    Place an oil drain pan under the transmission fluid cooler pipes (1).

  8. Remove the transmission fluid cooler inlet and outlet pipes (1) from the transmission, and position aside, or remove from the vehicle as necessary. Transmission Fluid Cooler Inlet and Outlet Pipe Replacement (LGX With RWD, Without V03) , or Transmission Fluid Cooler Inlet and Outlet Pipe Replacement (LGX With AWD, Without V03) , or Transmission Fluid Cooler Inlet and Outlet Pipe Replacement (LGX With RWD, With V03) .
  9. Plug the open fluid ports to prevent fluid loss and contamination.
  10. Starter Replacement (LGX) - Remove
  11. Transmission Converter Cover Replacement (Rear Wheel Drive) , or Transmission Converter Cover Replacement (All Wheel Drive)  - Remove
  12. GM4084382Courtesy of GENERAL MOTORS COMPANY

    Remove the transmission close out plug (1).

  13. Mark the torque converter to flexplate orientation to ensure proper realignment.
  14. GM4084885Courtesy of GENERAL MOTORS COMPANY

    Repeat 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 with the starter opening.
    2. Remove and Discard the torque converter bolt.
  15. GM4084937Courtesy of GENERAL MOTORS COMPANY

    Remove the catalytic converter brace bracket (2) from the transmission.

  16. Support the transmission with a suitable transmission jack.
  17. Fig 2: Identifying Lower Transmission To Engine Bolts
    GM4085785Courtesy of GENERAL MOTORS COMPANY

    Remove the lower transmission to engine bolts (1, 2, 3, 4, 5, 6).

  18. Support the transmission with a suitable transmission jack.
  19. Transmission Support Replacement (Automatic RWD) , or Transmission Support Replacement (Automatic AWD) - Remove
  20. Tilt the transmission downward just enough to gain access to the upper transmission fasteners.
  21. GM4085926Courtesy of GENERAL MOTORS COMPANY

    Disconnect the transmission vent hose retainers (1).

  22. Disconnect the electrical wiring harness retainers from the transmission to engine fasteners and from the transmission case.
  23. GM4085970Courtesy of GENERAL MOTORS COMPANY

    Remove the transmission to engine bolts (1, 2, 3, 4, 5).

  24. Pull the transmission straight back.
  25. Install the J-21366  strap onto the transmission bell housing to retain the torque converter.
  26. Remove the transmission from the vehicle.
  27. Transfer components as necessary.
  28. Inspect the transmission fluid cooler, hoses, and pipes for leaks or damage. Replace as necessary.
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