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Home >> Hummer >> 2008 >> H3 Luxury, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 201 (Automatic Transmission - 6L50/6L80/6L90 - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Repair Instructions - On Vehicle >> Transmission Replacement (6L50 All Wheel Drive) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the exhaust system. Refer to Exhaust System Replacement .
  3. Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement (RWD) or Rear Propeller Shaft Replacement (AWD) .
    4. Fig 1: View Of Manual Shift Shaft Nut
    GM1827761Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the shift linkage from the transmission.
    5. Fig 2: View Of Retainers
    GM1850371Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the transmission wiring harness connector (5) from the transmission by releasing the locking mechanism and rotating the latch counterclockwise. Refer to Automatic Transmission Inline 16-Way Connector Description .
  6. Disconnect the wiring harness retainers (4) from the transmission.
  7. Remove the transmission vent hose from the retaining clips (6) on the transmission mount assembly.
  8. Remove the front air deflector. Refer to Front Air Deflector Replacement .
  9. Remove the transmission fluid cooler lines form the cooler line retainer bracket.
  10. Place an oil drain pan under the transmission fluid cooler pipes.
    11. Fig 3: View Of TOC Line To Transmission Retainer Bolt
    GM1710028Courtesy of GENERAL MOTORS CORP.
  11. Remove the transmission fluid cooler pipes from the transmission, and position aside. Refer to Transmission Fluid Cooler Pipe Replacement - Rear .
  12. Remove and discard the O-rings. Do NOT reuse the O-rings.
  13. Plug the open outlet ports to prevent fluid loss and contamination.
    14. Fig 4: View Of Torque Converter Bolt Close Out Cover
    GM830376Courtesy of GENERAL MOTORS CORP.
  14. Remove the transmission close out plug.
  15. Mark the torque converter to flexplate/flywheel orientation to ensure proper realignment.
  16. Remove the torque converter bolt close out cover from the engine block.
    17. Fig 5: Identifying Torque Converter Bolts
    GM1644597Courtesy of GENERAL MOTORS CORP.
  17. 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 with the access hole.
    2. Remove and discard the torque converter bolt.
    18. Fig 6: View Of Intermediate Shaft Lower Pinch Bolt
    GM907425Courtesy of GENERAL MOTORS CORP.
  18. Disconnect the intermediate shaft from the power steering gear. Refer to Steering Gear Replacement .
    19. Fig 7: View Of Body Mounting Bolts
    GM1850365Courtesy of GENERAL MOTORS CORP.
  19. Support the transmission with a suitable transmission jack.
  20. Remove the transmission mount assembly. Refer to Transmission Mount Replacement (Rear Wheel Drive)  or Transmission Mount Replacement (All Wheel Drive) .
  21. Support the rear of the front frame with adjustable jack stands.
  22. Remove the bolts at the rear of the front frame.
  23. Loosen the bolts at the front of the front frame two turns but do NOT remove the bolts.
  24. Lower the rear of the front frame and the transmission.
    25. Fig 8: View Of Retainers
    GM1850371Courtesy of GENERAL MOTORS CORP.
  25. Lower the transmission and remove the vent hose (2) from the vent tube.
  26. Position the wire harness and vent tube aside.
    27. Fig 9: View Of Transfer Case
    GM830369Courtesy of GENERAL MOTORS CORP.
  27. Remove the transfer case. Refer to Transfer Case Assembly Replacement .
    28. Fig 10: Identifying Transmission Mounting Bolts
    GM1850362Courtesy of GENERAL MOTORS CORP.
  28. Remove the top two transmission mounting bolts (1).
    29. Fig 11: Identifying Right Side Transmission Mounting Bolts
    GM1644591Courtesy of GENERAL MOTORS CORP.
  29. Remove the right side transmission mounting bolts.
    30. Fig 12: Identifying Left Side Transmission Mounting Bolts
    GM1850360Courtesy of GENERAL MOTORS CORP.
  30. Remove the left side transmission mounting bolts.
  31. Pull the transmission free from the engine dowels.
  32. Separate the transmission from the engine approximately 25.4 mm (1 in) to clear the starter drive nose cone.
    33. IMPORTANT: Ensure clearance is maintained between the transmission and the following:
    • The starter drive nose cone
    • The catalytic converters
    • The oxygen sensors
    • The wiring harnesses
    • The cooler pipes
  33. Carefully lower the transmission from the vehicle.
  34. Flush the transmission oil cooler if necessary. Refer to Transmission Fluid Cooler Flushing and Flow Test (J 45096) .
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