GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1998 🢒 Bonneville 🢒 Suspension 🢒 Automatic Level Control 🢒 Trim Height
  1. Park the vehicle on level ground.
  2. Inspect the tire pressure. Ensure that all tires are inflated to the proper pressure.
  3. Inspect the fuel level. Verify that the fuel tank is full.
  4. Ensure that there is no extra weight in the passenger compartment or the trunk. The trunk must be empty except for the spare tire and the jack.
  5. On vehicles equipped with electronic level control (ELC), ensure that the ELC is operating properly.
  6. Place the front seat in the rear position.
  7. Bounce the vehicle three times at the front and at the rear in order to normalize the suspension.

    8. Object Number: 161317 Size: SH
  8. Measure the clearance (3) between the centerline of the rear bolt bushing (1) and the lowest point on the ball joint housing (2) (except the grease fitting).

    9. The clearance (3) should measure 50-70 mm (1 15/16-2 3/4 in) on the LSS, Eighty-Eight, Lesabre, and Bonneville.


    Object Number: 205832 Size: SH
  9. Measure the clearance (3) between the centerline of the rear bolt bushing (1) and the lowest point on the ball joint housing (2) (except the grease fitting).

    10. The clearance (3) should measure 68-88 mm (2 11/16-3 7/16 in) on the LSS, Eighty-Eight, Lesabre, and Bonneville.


    Object Number: 196523 Size: MH
  10. Measure the clearance (1) between the front underbody (4) and the ground (2).

    11. The clearance (1) should measure 229-249 mm (9-9 13/16 in) on the LSS, Eighty-Eight, Lesabre, and Bonneville.


    Object Number: 205834 Size: SH
  11. Measure the clearance (1) between the rear underbody and the ground (2).

    12. The clearance (1) should measure 236-256 mm (9 9/32-10 1/16 in) on the LSS, Eighty-Eight, Lesabre, and Bonneville.

  12. Verify that all of the above clearances measure within the maximum variation from the specified values.

    13. The Maximum variation side to side and front to rear is 19 mm (3/4 in).