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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1613 (Automatic Transmission - ALLISON - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Transmission Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Shift Cable Bracket & Bolts
    GM1826779Courtesy of GENERAL MOTORS CORP.
  1. Install the shift cable bracket and bolts to the transmission.

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

    2. Fig 2: Installing Special Tool To Converter Housing
    GM702530Courtesy of GENERAL MOTORS CORP.
  2. Install J 21366  to the converter housing in order to keep the torque converter from sliding off of the turbine shaft.
  3. Raise the transmission into place while simultaneously installing the transmission fill tube.
  4. Remove the J 21366 
    5. Fig 3: View of Transmission To Engine Stud & Bolts
    GM686685Courtesy of GENERAL MOTORS CORP.
    NOTE: Do not install the transmission by drawing it to the engine using the studs and bolts.
  5. Align the transmission with the engine using the alignment dowels located at the rear of the engine.
    6. CAUTION: Refer to Fastener Caution .
    NOTE: Ensure that the torque converter can be rotated before tightening the bolts and studs.
  6. Install the converter housing bolts and studs.

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

    7. Fig 4: Wire Harness/Vent Tube Bracket Nut & Converter Housing Stud
    GM702529Courtesy of GENERAL MOTORS CORP.
  7. 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).

  8. Install the transmission fill tube and nut to the converter housing stud.

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

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

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

  16. Install the transmission heat shield. Refer to Transmission Heat Shield Replacement .
  17. Position the wiring harness branches.
    18. Fig 7: Identifying Transmission Main Electrical Connector
    GM702524Courtesy of GENERAL MOTORS CORP.
  18. Connect the transmission main electrical connector (2).
    19. Fig 8: View Of Transmission Wiring Harness
    GM1257741Courtesy of GENERAL MOTORS CORP.
  19. Connect the electrical connectors on the transmission and transfer case, if equipped.
    20. Fig 9: Removing/Installing Fuel Line Bracket Nut
    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. Connect the shift cable and lines to the rear bracket on the transmission.
    23. Fig 11: Range Selector Cable
    GM1826780Courtesy of GENERAL MOTORS CORP.
  23. Install the range selector cable end to the transmission range selector lever stud.
    24. Fig 12: Range Selector Cable Heat Shield
    GM1826778Courtesy of GENERAL MOTORS CORP.
  24. Install the range selector cable heat shield.
    25. NOTE: 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.

    Tighten: 

    • Tighten the front bolt to 25 N.m (18 lb ft).
    • Tighten the rear bolt to 25 N.m (18 lb ft).

    26. Fig 13: 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 14: 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 Replacement (V8) or Starter Replacement (V6) or Starter Replacement (6.6L) .
    31. Fig 15: Transmission Oil Cooler Lines On 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. Refer to Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection .
  34. Lower the vehicle.
    35. Fig 16: Cooling Fan Shroud & Rubber Seal
    GM1989946Courtesy of GENERAL MOTORS CORP.
    NOTE: Improper installation could cause damage to the fan and shroud while vehicle is in service.
  35. Make sure the orientation of the cooling fan shroud (1) and rubber seal (2) are installed correctly
    36. Fig 17: Identifying Fan Shroud Mounting Brackets & Bolts
    GM1674565Courtesy of GENERAL MOTORS CORP.
  36. Fully tighten the 3 engine cooling fan shroud bolts (1).

    Tighten:  Tighten the bolts to 8 N.m (71 lb in).

  37. Install the upper fan shroud. Refer to Engine Coolant Fan Upper Shroud Replacement (LMM Diesel) or Engine Coolant Fan Upper Shroud Replacement (Mechanical)
  38. Connect both negative battery cables. Refer to Battery Negative Cable Disconnection and Connection (Single Battery) or Battery Negative Cable Disconnection and Connection (Dual Batteries) or Battery Negative Cable Disconnection and Connection (Auxiliary Battery) .
  39. Fill the transmission with new transmission fluid.
  40. Install the transmission fluid level indicator.
  41. If a replacement transmission was installed, perform the "Fast Learn" procedure using a scan tool. Refer to FastLearn Procedure .
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