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Home >> Cadillac >> 2017 >> CTS Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Transmission Replacement (M5U with LT4 Engine) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the J-21366  strap from the transmission bell housing.
  2. Install the transmission to the vehicle.
  3. Install the six transmission to engine bolts (1, 2, 3, 4, 5, 6) and tighten to 58 N.m (43 lb ft).
    Fig 1: Transmission To Engine Bolts
    GM4066436Courtesy of GENERAL MOTORS COMPANY
    CAUTION: Refer to Fastener Caution .
  4. Connect the transmission vent hose retainer (1) to the transmission bolt.
    Fig 2: Transmission Vent Hose Retainer
    GM4069147Courtesy of GENERAL MOTORS COMPANY
  5. Connect the electrical wiring harness retainers to the transmission to engine fasteners and to the transmission case.
  6. Install the transmission support. Refer to Transmission Support Replacement (RWD) and Transmission Support Replacement (AWD) .
  7. Remove the transmission jack from under the vehicle.
  8. Align the torque converter to flexplate orientation marks made during the removal procedure.
  9. Complete the following steps for all torque converter bolts (1):
    Fig 3: Converter And Converter Bolts
    GM4070117Courtesy 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.
    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).
  10. Install the transmission close out plug (1).
    Fig 4: Transmission Close Out Plug
    GM4070214Courtesy of GENERAL MOTORS COMPANY
  11. Transmission Converter Cover Replacement (Left Side, M5U) »Install
  12. Install the starter motor. Refer to Starter Replacement (LT4) .
  13. Install the lower transmission to engine bolts (1, 2) and tighten to 58 N.m (43 lb ft).
    Fig 5: Lower Transmission To Engine Bolts
    GM4066598Courtesy of GENERAL MOTORS COMPANY
  14. Install the catalytic converter brace bracket (3) to the transmission.
    Fig 6: Catalytic Converter Brace Bracket
    GM4069891Courtesy of GENERAL MOTORS COMPANY
  15. Install the two retaining nuts (1) and tighten to 22 N.m (16 lb ft).
  16. Install the two retaining bolts (2) and tighten to 22 N.m (16 lb ft).
  17. Install the transmission fluid cooler inlet and outlet pipe (1) to the transmission. Refer to Transmission Fluid Cooler Inlet and Outlet Pipe Replacement (LT4 With M5U) .
    Fig 7: Transmission Fluid Cooler Pipes
    GM4021840Courtesy of GENERAL MOTORS COMPANY
  18. Connect the wiring harness retainers and connectors to the transmission.
  19. Install the cable in the bracket, then slide the retainer (4) rearward to lock the transmission range selector lever cable in the bracket.
    Fig 8: Transmission Range Selector Lever Cable
    GM4032383Courtesy of GENERAL MOTORS COMPANY
  20. Connect the transmission range selector lever cable terminal (1) to the transmission manual shift lever pin (2).
  21. Adjust the cable. Refer to Range Selector Lever Cable Adjustment .
  22. Transmission Heat Shield Replacement »Install
  23. Install the propeller shaft. Refer to Two-Piece Propeller Shaft Replacement (LT4, LTG) .
  24. Install the left side catalytic converter. Refer to Catalytic Converter Replacement - Left Side (LT4)
  25. Lower the vehicle.
  26. Check the transmission fluid level and fill if necessary. Refer to Transmission Fluid Level and Condition Check .
  27. Perform the solenoid valve characterization. Refer to Solenoid Valve Characterization Reprogramming .
  28. Perform the service fast learn procedure. Refer to Transmission Service Fast Learn Procedure .
    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
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