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Home >> Pontiac >> 2008 >> G8 Base >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 5L40-E/5L50-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Repair Instructions - On Vehicle >> Transmission Replacement >> Installation Procedure

Installation Procedure

    IMPORTANT: The engine mounts must NOT bend or deflect from the vertical position, damage to the mount will occur.
    IMPORTANT: Ensure clearance is maintained between the transmission and the following:
    • The catalytic converters
    • The wiring harnesses
    • The cooler pipes
    • The propeller shaft
  1. Using the transmission jack, carefully raise the transmission to the vehicle.
  2. Align the transmission with the engine dowels.
    3. Fig 1: View Of Transmission-To-Engine Mounting Bolts (Right Side)
    GM1562780Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  3. Install the right hand side transmission retaining bolts.

    Tighten:  Tighten the bolts to 50 N.m (37 lb. ft).

  4. Install the remaining transmission retaining bolts.
    5. Fig 2: Engine Close Out Cover
    GM1960862Courtesy of GENERAL MOTORS CORP.
  5. Install the engine close out cover.

    Tighten:  Tighten the studs to 10 N.m (89 lb. in).

  6. Remove the engine and transmission lowering blocks and engine balance plate.
  7. Raise the powertrain back up into the engine bay and install the front sub frame bolts.

    Tighten:  Tighten the front sub frame bolts to 160 N.m (118 lb. ft.).

    Tighten:  Tighten the transmission support to under body retaining bolt to 63 N.m (46 lb ft).

    8. Fig 3: Identifying Engine Wiring Harness Retaining Clips
    GM785771Courtesy of GENERAL MOTORS CORP.
  8. Connect the engine wiring harness retaining clips (1) to the transmission mounting bolts.
  9. Install the steering shaft to the steering rack.
    10. Fig 4: View Of Transmission Fluid Cooler Pipes
    GM785867Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Replace the O-rings seals if cracked, cut, or distorted.
  10. Lubricate the O-rings seals with automatic transmission fluid.
  11. Install the O-rings seals onto the cooler pipes prior to inserting the cooler pipes into the transmission.
  12. Insert the transmission fluid cooler pipes into the transmission.
  13. Install the bolt securing the transmission fluid cooler pipe retainer to the transmission.

    Tighten:  Tighten the bolt to 25 N.m (18 lb. ft).

    14. Fig 5: Transmission Fluid Cooler Pipes Brace
    GM1955714Courtesy of GENERAL MOTORS CORP.
  14. Install the bolt securing the transmission fluid cooler pipes brace to the engine.

    Tighten:  Tighten the bolt to 50 N.m (37 lb. ft).

    15. Fig 6: Identifying Starter Motor To Cylinder Block Retaining Bolts
    GM1958089Courtesy of GENERAL MOTORS CORP.
  15. Align the torque converter to flexplate/flywheel orientation marks made during the removal procedure.
    16. IMPORTANT: Torque converter bolts are self locking and must be replaced with NEW torque converter bolts every time the bolts are removed.
  16. Repeat the following steps for all 3 torque converter bolts:
    1. Rotate the harmonic balancer center bolt clockwise ONLY, in order to align the torque converter bolt holes in the flexplate/flywheel with the starter motor opening in the engine block.
    2. To aid in alignment of the torque converter to the flexplate/flywheel. Install all 3 NEW torque converter retaining bolts before fully tightening.

      Tighten:  Tighten the bolts to 63 N.m (46 lb. ft).

  17. Install the starter motor. Refer to Starter Motor Replacement (3.6L Engine) or Starter Motor Replacement (6.0L Engine) .
  18. Install the air deflector front (1). Refer to Front Air Deflector Replacement .
    19. Fig 7: Disconnecting Wiring Harness Clips From Transmission
    GM785869Courtesy of GENERAL MOTORS CORP.
  19. Connect the wiring harness clips to the transmission.
    20. Fig 8: View Of Transmission Wiring Harness Connector & Locking Latch
    GM785868Courtesy of GENERAL MOTORS CORP.
  20. Connect the transmission wiring harness connector (1) to the transmission by rotating the locking latch (2) clockwise.
    21. Fig 9: View Of Propeller Shaft Coupler
    GM801931Courtesy of GENERAL MOTORS CORP.
  21. Install the propeller shaft coupler (1) to the transmission flange. Refer to Propeller Shaft Replacement .
    22. Fig 10: Identifying Shift Selector Linkage Rod To Shift Selector Shaft Retaining Nut
    GM1958702Courtesy of GENERAL MOTORS CORP.
  22. Place the transmission in the park position by rotating the shift shaft (2) fully counter clockwise.
  23. Connect the shift linkage (1) to the transmission.
  24. Install the transmission manual shift shaft retaining nut (3).

    Tighten:  Tighten the nut to 15 N.m (11 lb. ft).

  25. Check the transmission fluid level (fill if necessary). Refer to Transmission Fluid Check .
  26. Adjust the shift control linkage. Refer to Shift Control Linkage Adjustment .
  27. Lower the vehicle.
  28. Connect the evap purge pipe.
  29. Install radiator retaining clips
  30. Install air intake ducting from engine
  31. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  32. The transmission control module must be programmed with the proper software/calibrations. Refer to Control Module References .
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