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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1035 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> On-Vehicle Repair Information >> Transmission Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Installing J 21366 To Converter Housing
    GM702530Courtesy of GENERAL MOTORS CORP.
  1. Install J 21366  to the converter housing in order to keep the torque converter from sliding off of the turbine shaft.
  2. Raise the transmission into place while simultaneously installing the transmission fill tube.
  3. Remove the J 21366 
    4. Fig 2: View of Transmission To Engine Stud & Bolts
    GM686685Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not install the transmission by drawing it to the engine using the studs and bolts.
  4. Align the transmission with the engine using the alignment dowels located at the rear of the engine.
    5. NOTE: Refer to Fastener Notice .
    IMPORTANT: Ensure that the torque converter can be rotated before tightening the bolts and studs.
  5. Install the converter housing bolts and studs.

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

    6. Fig 3: Wire Harness/Vent Tube Bracket Nut & Converter Housing Stud
    GM702529Courtesy of GENERAL MOTORS CORP.
  6. Install the wire harness/vent tube bracket and nut to the converter housing stud.

    Tighten:  Tighten the nut to 18 N.m (13 lb ft).

    7. Fig 4: View Of Fill Tube To Bellhousing Nuts
    GM702776Courtesy of GENERAL MOTORS CORP.
  7. Install the transmission fill tube and nuts to the converter housing studs.

    Tighten:  Tighten the nuts to 18 N.m (13 lb ft).

  8. If the vehicle is equipped with a PTO unit, connect and/or install the components at this time.
    9. Fig 5: Securing Safety Chain Around Transmission
    GM702527Courtesy of GENERAL MOTORS CORP.
  9. Remove the safety chain from around the transmission.
  10. Four wheel drive vehicles install the transfer case, transmission support and propeller shafts. Refer to the appropriate procedure:
  11. Two wheel drive vehicles, install the transmission mount to the transmission. Refer to Transmission Mount Replacement .
  12. Two wheel drive vehicles, install the transmission support. Refer to Transmission Support Crossmember Replacement (2WD 2500 HD/3500) or Transmission Support Crossmember Replacement (2WD 1500/2500) or Transmission Support Crossmember Replacement (4WD 1500/2500) or Transmission Support Crossmember Replacement (4WD 2500 HD/3500) .
  13. Two wheel drive vehicles, install the propeller shaft. Refer to One-Piece Propeller Shaft Replacement or Two-Piece Propeller Shaft Replacement .
    14. Fig 6: Exhaust Pipe Hanger Bracket
    GM694239Courtesy of GENERAL MOTORS CORP.
  14. Position the exhaust hanger and install the bolts.

    Tighten:  Tighten the bolts to 12 N.m (106 lb in).

  15. Install the transmission heat shield. Refer to Transmission Heat Shield Replacement .
  16. Position the wiring harness branches.
    17. Fig 7: Identifying Transmission Main Electrical Connector
    GM702524Courtesy of GENERAL MOTORS CORP.
  17. Connect the transmission main electrical connector (2).
    18. Fig 8: Identifying Electrical Connectors And Sensors
    GM702774Courtesy of GENERAL MOTORS CORP.
  18. Two wheel drive vehicles, connect the electrical connectors to the output speed sensor (3), turbine speed sensor (1), and the input speed sensor (2).
  19. Four wheel drive vehicles, connect the electrical connectors to the turbine speed sensor (1), the input speed sensor (2) and any remaining electrical connectors on the transfer case.
    20. Fig 9: Identifying Fuel Line Bracket
    GM702523Courtesy of GENERAL MOTORS CORP.
  20. Install the fuel line bracket and nut to the transmission converter housing stud.

    Tighten:  Tighten the nut to 18 N.m (13 lb ft).

    21. Fig 10: Identifying Fuel Line Retainer Bolts
    GM702521Courtesy of GENERAL MOTORS CORP.
  21. Install the fuel line retainer (1) and bolts to the left side of the transmission.

    Tighten:  Tighten the bolts to 2.5 N.m (22 lb in).

    22. Fig 11: View Of Shift Cable Bracket And Bolts
    GM1826779Courtesy of GENERAL MOTORS CORP.
  22. Install the shift cable bracket and bolts to the transmission.

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

    23. Fig 12: Range Selector Cable
    GM1826780Courtesy of GENERAL MOTORS CORP.
  23. Install the range selector cable end to the transmission range selector lever stud.
    24. Fig 13: Range Selector Cable Heat Shield
    GM1826778Courtesy of GENERAL MOTORS CORP.
  24. Install the range selector cable heat shield.
    25. IMPORTANT: Install bolts by hand then mechanically tighten the front bolt first and the rear bolt last. Failure to tighten the bolts in the specified order will result in misalignment of the heat shield.
  25. Install the range selector cable heat shield bolts.

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

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

    26. Fig 14: Identifying Converter Housing Access Hole Cover
    GM713136Courtesy of GENERAL MOTORS CORP.
  26. Remove the access hole cover (1) on the converter housing in order to rotate the converter and align the first torque converter bolt.
    27. Fig 15: View Of Torque Convertor Bolt
    GM702519Courtesy of GENERAL MOTORS CORP.
  27. If reusing the torque converter bolts, clean the bolt threads and apply LOCTITE 242 GM P/N 12345382 (Canadian P/N 10953489), or equivalent to the threads prior to installation.
  28. Install the torque converter bolts.

    Tighten:  Tighten the bolts to 60 N.m (44 lb ft).

  29. Install the converter housing access hole cover.
  30. Install the starter motor. Refer to Starter Motor Replacement (4.3L) or Starter Motor Replacement (4.8L, 5.3L, 6.0L, and 6.2L) or Starter Motor Replacement (6.6L) .
    31. Fig 16: View Of Transmission Oil Cooler Lines At Transmission
    GM686709Courtesy of GENERAL MOTORS CORP.
  31. Remove the plugs from the transmission oil cooler line fittings in the transmission case, if necessary.
  32. Flush the transmission oil cooler and lines, if necessary. Refer to Transmission Fluid Cooler Flushing and Flow Test .
  33. Connect the transmission oil cooler lines (1, 2) to the transmission.
  34. Lower the vehicle.
  35. Install the cooling fan and shroud. Refer to Cooling Fan and Shroud Replacement (Non-HP2) .
  36. Connect both negative battery cables. Refer to Battery Negative Cable Disconnection and Connection (w/Single Battery) or Battery Negative Cable Disconnection and Connection (w/Auxiliary Battery) or Battery Negative Cable Disconnection and Connection (w/Dual Batteries) .
  37. Fill the transmission with new transmission fluid.
  38. Install the transmission fluid level indicator.
  39. If a replacement transmission was installed, perform the "FastLearn" procedure using a scan tool. Refer to FastLearn Procedure .
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