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Underbody Misalignment Check

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: If equipped with fire suppression system, depower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM .
WARNING: The electrical power to the air suspension system must be turned off prior to hoisting, jacking or towing an air suspension vehicle. Failure to do so can result in unexpected inflation or deflation of the air springs, which can result in shifting of the vehicle during these operations.
  1. The dimensions of the underbody must be restored to provide the correct front and rear wheel alignment geometry.
  2. All the dimensions are measured between the centers of the existing holes in the underbody unless otherwise specified.
  3. Inspect all underbody structural members for cracks, twists or bends. Check all welded connections for cracks. Inspect the support brackets for looseness. Carry out any necessary repairs or install new components as necessary.
  4. Underbody dimension tolerances are +/- 3 mm (0.12 in).
    UNDERBODY DIMENSIONS

    Dimension Ford/Mercury/Ford H.D. Ford NGV LWB/Ford LWB
    1 1,040 mm (41.6 in) 1,040 mm (41.6 in)
    2 1,311 mm (52.44 in) 1,311 mm (52.44 in)
    3 1,052 mm (42.08 in) 1,052 mm (42.08 in)
    4 1,231 mm (49.24 in) 1,231 mm (49.24 in)
    5 1,226 mm (49.04 in) 1,226 mm (49.04 in)
    6 1,015 mm (40.6 in) 1,015 mm (40.6 in)
    7 1,120 mm (44.8 in) 1,120 mm (44.8 in)
    8 473 mm (18.92 in) 473 mm (18.92 in)
    9 1,563 mm (62.52 in) 1,563 mm (62.52 in)
    10 2,479 mm (99.16 in) 2,632 mm (105.28 in)
    11 3,558 mm (142.32 in) 3,711 mm (148.44 in)
    12 4,684 mm (187.36 in) 4,837 mm (193.48 in)
    13 107 mm (4.28 in) 107 mm (4.28 in)
    14 355 mm (14.2 in) 355 mm (14.2 in)
    15 234 mm (9.36 in) 234 mm (9.36 in)
    16 81 mm (3.24 in) 81 mm (3.24 in)
    Fig 1: Identifying Underbody Dimensions
    G04586640Courtesy of FORD MOTOR CO.
    5. WARNING: If equipped with fire suppression system, repower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM .
  5. If equipped with fire suppression system, repower the system.
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