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Home >> Cadillac >> 2019 >> CTS Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 58 (Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Transmission Replacement (M5U with LT4) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and suitably support the vehicle. Lifting and Jacking the Vehicle (CTS-V) .
  2. Remove the left side catalytic converter. Catalytic Converter Replacement - Left Side (LT4)
  3. Two-Piece Propeller Shaft Replacement (LT4, LTG) - Remove
  4. Transmission Heat Shield Replacement  - Remove
  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. GM4021840Courtesy 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 (LT4 With M5U) .
  9. Plug the open fluid ports to prevent fluid loss and contamination.
  10. Starter Replacement (LT4) - Remove
  11. Transmission Converter Cover Replacement (Right Side, M5U) Transmission Converter Cover Replacement (Left Side, M5U)  - Remove
  12. GM4070214Courtesy of GENERAL MOTORS COMPANY

    Remove the transmission close out plug (1).

  13. Mark the torque converter to flexplate orientation to ensure proper realignment.
  14. GM4023357Courtesy 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. GM4066598Courtesy of GENERAL MOTORS COMPANY

    Remove the lower transmission to engine bolts (1, 2).

  16. GM4069891Courtesy of GENERAL MOTORS COMPANY

    Remove the catalytic converter brace bracket (3) from the transmission.

  17. Support the transmission with a suitable transmission jack.
  18. Transmission Support Replacement (RWD) - Remove
  19. Tilt the transmission downward just enough to gain access to the upper transmission fasteners.
  20. GM4069147Courtesy of GENERAL MOTORS COMPANY

    Disconnect the transmission vent hose retainer (1) from the transmission bolt

  21. Disconnect the electrical wiring harness retainers from the transmission to engine fasteners and from the transmission case.
  22. GM4066436Courtesy of GENERAL MOTORS COMPANY

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

  23. Pull the transmission straight back.
  24. Install the J-21366  strap onto the transmission bell housing to retain the torque converter.
  25. Remove the transmission from the vehicle.
  26. Transfer components as necessary.
  27. Flush and flow test the transmission cooler and transmission pipes. Transmission Fluid Cooler Flow Test and Flushing
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