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Home >> Buick >> 2019 >> LaCrosse Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Power Transfer Unit/Transfer Case - AAM >> Repair Instructions - On Vehicle >> Power Transfer Unit Case Replacement >> Installation Procedure

Installation Procedure

  1. GM3931381Courtesy of GENERAL MOTORS COMPANY

    Clean the contact surfaces between the transfer case and the transmission.

  2. Install a NEW transfer case-to-transmission O-ring (1).
  3. GM4436573Courtesy of GENERAL MOTORS COMPANY

    Support the transfer case with a suitable jack, and secure with suitable straps.

  4. Raise and align the transfer case in the correct position in relation to the transmission.
  5. Install the transfer case (6) to the transmission.
  6. Position the wiring harness bracket to the transfer case.
  7. CAUTION:

    Refer to Fastener Caution .

  8. Install the transfer case-to-transmission bolts (1, 3, 4, 5) and tighten to 100 N.m (74 lb ft).
  9. Install a NEW transfer case-to-transmission bracket bolt (2) and tighten to 100 N.m (74 lb ft) plus 60-75 degrees.
  10. GM4439179Courtesy of GENERAL MOTORS COMPANY

    Install a NEW transfer case-to-transmission bracket bolt (1) and tighten to 100 N.m (74 lb ft) plus 60-75 degrees.

  11. Connect the propeller shaft to the transfer case. Propeller Shaft Replacement
  12. GM3824314Courtesy of GENERAL MOTORS COMPANY

    Connect the transfer case vent hose (1) to the transfer case (2).

  13. Install the transfer case bracket. Transfer Case Bracket Replacement 
  14. Install the right wheel drive shaft. Front Wheel Drive Half Shaft Replacement - Right Side (AWD) , or Front Wheel Drive Half Shaft Replacement - Right Side (FWD with LGX) , or Front Wheel Drive Half Shaft Replacement - Right Side (FWD with LHN)
  15. Install the catalytic converter. Three-Way Catalytic Converter Replacement (Bank 1, FWD) , or Three-Way Catalytic Converter Replacement (Bank 1, AWD) , or Three-Way Catalytic Converter Replacement (Bank 2)