Sierra, Silverado 2006-2007

Transfer Case Removal & Installation

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  1. Remove or disconnect the following:

    Transfer case shields
     
    Front propeller shaft
     
    Rear propeller shaft
     
    Shift rod from the transfer case
     
    Vent hose from the transfer case
     
    Vehicle Speed Sensor (VSS) electrical connectors
     
    All necessary wiring harnesses from the transfer case
     

  2.  
  3. Support the transfer case with a transmission jack.
  4.  
  5. If equipped with a NV3500 manual transmission, remove or disconnect the following:

    Bolt securing the left side support brace to the transmission
     
    Bolt and stud securing the left side support brace to the transfer case
     
    Two bolts securing the right side support brace to the transmission and transfer case
     

  6.  
  7. Remove or disconnect the following:

    Six nuts securing the transfer case and bracket to the transmission or transmission adapter, as applicable
     
    Transfer case
     
    Gasket, then discard

    Click image to see an enlarged view

    Fig. Transfer case mounting nuts (1), transfer case (2) and transfer case gasket (3)

     

  8.  

To install:

  1. Install a new gasket to the transmission. Use Teflon pipe sealant GM P/N 12346004 in order to hold the gasket in place.
  2.  
  3. Raise and position the transfer case to the vehicle.
  4.  
  5. Install or connect the following:

    Six nuts securing the transfer case and bracket to the transmission adapter or transmission. Tighten to 37 ft. lbs. (50 Nm).
     

  6.  
  7. If equipped with a manual transmission, install or connect the following:

    Bolt securing the left side support brace to the transmission and tighten to 37 ft. lbs. (50 Nm)
     
    Bolt and stud securing the left side support brace to the transfer case and tighten to 37 ft. lbs. (50 Nm)
     
    Two bolts securing the right side support brace to the transmission and transfer case and tighten to 37 ft. lbs. (50 Nm)
     

  8.  
  9. Install or connect the following:

    Vent hose to the transfer case
     

  10.  
  11. Check the transfer case oil level.

    VSS electrical connectors
     
    Wiring harness to the transfer case
     
    Shift rod to the transfer case
     
    Front and rear propeller shafts
     
    Transfer case shields
     

  12.  
  13. Lower the vehicle.
  14.  

 
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