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Home >> Buick >> 2018 >> Envision Base >> Repair and Diagnosis (Single Page) >> 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 power transfer unit case and the transmission.

  2. Install a NEW power transfer unit case-to-transmission O-ring (1).
  3. CAUTION:

    Use care when installing the transfer case assembly to avoid contact with the pinion spline. Contact with the pinion spline may cause damage to the transfer case assembly.

  4. GM3824411Courtesy of GENERAL MOTORS COMPANY

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

  5. Raise and align the power transfer unit case in the correct position in relation to the transmission.
  6. Install the power transfer unit case (2) to the transmission.
  7. CAUTION:

    Refer to Fastener Caution .

  8. Install the power transfer unit case-to-transmission bolts (1) and tighten to 100 N.m (74 lb ft).
  9. Connect the two piece propeller shaft to the power transfer unit case. Two-Piece Propeller Shaft Replacement
  10. GM3824314Courtesy of GENERAL MOTORS COMPANY

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

  11. For the 2.0L LTG engine, install the transfer case bracket. Transfer Case Bracket Replacement 
  12. For the 1.5L LFV engine, install the transfer case brace. Transmission Brace Replacement 
  13. Install the right wheel drive shaft. Refer to Front Wheel Drive Shaft Replacement - Right Side (MHG, M2D With F46)Front Wheel Drive Shaft Replacement - Right Side (MHG, M2D Without F46) .
  14. Install the exhaust front pipe. Refer to Exhaust Front Pipe Replacement (LTG)Exhaust Front Pipe Replacement (LCV) .
  15. Check the power transfer unit fluid level. Adhesives, Fluids, Lubricants, and Sealers