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Home >> Buick >> 2017 >> LaCrosse Base >> Repair and Diagnosis >> Transmission >> Power Transfer Unit/Transfer Case - AAM >> Repair Instructions - On Vehicle >> Power Transfer Unit Case Replacement >> Removal Procedure

Removal Procedure

  1. Remove the right wheel drive shaft. Front Wheel Drive Half Shaft Replacement - Right Side (AWD)Front Wheel Drive Half Shaft Replacement - Right Side (FWD)
  2. Remove the catalytic converter. Three-Way Catalytic Converter Replacement (Bank 1, FWD)Three-Way Catalytic Converter Replacement (Bank 1, AWD)Three-Way Catalytic Converter Replacement (Bank 2)
  3. Remove the transfer case bracket. Transfer Case Bracket Replacement 
    4. Fig 1: Power Transfer Unit Case Vent Hose
    GM3824314Courtesy of GENERAL MOTORS COMPANY
  4. Disconnect the transfer case vent hose (1) from the transfer case (2).
  5. Disconnect the propeller shaft from the transfer case. Propeller Shaft Replacement
  6. Support the transfer case (2) with a suitable jack, and secure with suitable straps.
    7. Fig 2: Transmission Mount Bracket To Transmission Bolt
    GM4439179Courtesy of GENERAL MOTORS COMPANY
  7. Remove and DISCARD the transmission bracket to transfer case bolt (1).
    8. Fig 3: Transmission Mount Bracket To Transmission Bolt
    GM4436573Courtesy of GENERAL MOTORS COMPANY
  8. Remove and DISCARD the transfer case-to-transmission bracket bolt (2).
  9. Remove the remaining transfer case retaining bolts (1, 3, 4 5).
  10. Remove the wiring harness bracket from the transfer case.
  11. Separate the transfer case (6) from the transmission and remove the transfer case.
    12. Fig 4: Power Transfer Unit Face Seal
    GM3931381Courtesy of GENERAL MOTORS COMPANY
  12. Remove and DISCARD the transfer case-to-transmission O-ring.
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