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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 920 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> On-Vehicle Repair Instructions >> Transmission Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: If replacing a failed transmission, the "FastLearn" (adapt) procedure must be performed. This can be done in one step using a scan tool. If this procedure is not done, the transmission control module's (TCM's) adaptive values will still be at the settings that it learned for the old transmission, and will be in slow adaptive mode. Under these conditions, it would take an unacceptably long time for the adaptive values to converge to levels suitable for the new transmission.
  1. Remove the transmission fluid level indicator.
  2. Remove the starter motor. Refer to Starter Motor Replacement (6.6L) .
    3. Fig 1: View Of Torque Convertor Bolt
    GM702519Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Rotate the engine clockwise ONLY, rotating the engine counterclockwise may loosen the crankshaft balancer bolt.
  3. Rotate the engine clockwise, using the crankshaft bolt in order to access the torque converter bolts through the starter opening. Have an assistant rotate the engine while aligning the bolts.
  4. Remove the torque converter bolts.
  5. Completely raise the vehicle.
  6. Drain the transmission fluid.
    7. Fig 2: Range Selector Cable Heat Shield
    GM1826778Courtesy of GENERAL MOTORS CORP.
  7. Remove the range selector cable heat shield bolts.
  8. Remove the range selector cable heat shield.
    9. Fig 3: Range Selector Cable
    GM1826780Courtesy of GENERAL MOTORS CORP.
  9. Remove the range selector cable end from the transmission range selector lever stud.
    10. Fig 4: View Of Shift Cable Bracket And Bolts
    GM1826779Courtesy of GENERAL MOTORS CORP.
  10. Remove the shift cable bracket bolts and bracket from the transmission.
  11. Position the bracket with the cable attached out of the way.
    12. Fig 5: Identifying Fuel Line Retainer Bolts
    GM702521Courtesy of GENERAL MOTORS CORP.
  12. Remove the fuel line retainer (1) bolts on the left side of the transmission.
    13. Fig 6: Identifying Fuel Line Bracket
    GM702523Courtesy of GENERAL MOTORS CORP.
  13. Remove the fuel line bracket nut from the converter housing stud.
    14. Fig 7: View Of Transmission Electrical Connectors
    GM702774Courtesy of GENERAL MOTORS CORP.
  14. Two wheel drive vehicles disconnect the turbine speed sensor (1), input speed sensor (2) and output speed sensor (3).
  15. Four wheel drive vehicles disconnect the electrical connectors to the turbine speed sensor (1), the input speed sensor (2) and any electrical connectors on the transfer case.
    16. Fig 8: Transmission Rear Electrical Connector
    GM659284Courtesy of GENERAL MOTORS CORP.
  16. Disconnect the transmission main electrical connector. J 44257  may be used, but is not required.
  17. Remove the transmission heat shield. Refer to Transmission Heat Shield Replacement .
    18. Fig 9: Exhaust Pipe Hanger Bracket (6.6L and 8.1L Engines, Allison Transmission)
    GM694239Courtesy of GENERAL MOTORS CORP.
  18. Remove the exhaust hanger bolts and reposition the hanger.
  19. Support the transmission with a transmission jack.
  20. Two wheel drive vehicles remove the propeller shaft. Refer to One-Piece Propeller Shaft Replacement or Two-Piece Propeller Shaft Replacement .
  21. Two wheel drive vehicles, remove the transmission support. Refer to Transmission Support Crossmember Replacement (2WD 1500/2500) or Transmission Support Crossmember Replacement (2WD 2500 HD/3500) or Transmission Support Crossmember Replacement (4WD 1500/2500) or Transmission Support Crossmember Replacement (4WD 2500 HD/3500) .
  22. Two wheel drive vehicles, remove the transmission mount from the transmission. Refer to Transmission Mount Replacement .
  23. Four wheel drive vehicles, remove the transfer case. Refer to the appropriate procedure:
  24. Reposition any wiring harness branches out of the way.
    25. Fig 10: Securing Safety Chain Around Transmission
    GM702527Courtesy of GENERAL MOTORS CORP.
  25. Secure a safety chain around the transmission. Use care not to overlap any wiring, fuel lines, or other related components.
    26. Fig 11: View Of Transmission Oil Cooler Lines At Transmission
    GM686709Courtesy of GENERAL MOTORS CORP.
  26. Disconnect the transmission oil cooler lines (1, 2) from the transmission.
  27. Plug the transmission oil cooler line fittings in the transmission case, if necessary.
  28. If the vehicle is equipped with a power take off (PTO) unit, disconnect and/or remove any necessary components to facilitate transmission removal.
    29. Fig 12: View Of Fill Tube To Bellhousing Nuts
    GM702776Courtesy of GENERAL MOTORS CORP.
  29. Remove the transmission fill tube nuts from the converter housing studs.
    30. Fig 13: Identifying Wire Harness/Vent Tube Bracket
    GM702529Courtesy of GENERAL MOTORS CORP.
  30. Remove the wire harness/vent tube bracket nut from the converter housing stud and reposition the bracket.
    31. Fig 14: View of Transmission To Engine Stud & Bolts
    GM686685Courtesy of GENERAL MOTORS CORP.
  31. Remove the remaining converter housing bolts and studs.
  32. Separate the transmission from the engine.
    33. Fig 15: Installing J 21366 To Converter Housing
    GM702530Courtesy of GENERAL MOTORS CORP.
  33. Install J 21366  to the converter housing in order to keep the torque converter from sliding off of the turbine shaft.
  34. Carefully lower the transmission from the vehicle while simultaneously removing the fill tube.
  35. Remove the J 21366  .
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