GM Service Manual Online
For 1990-2009 cars only

Important: When measuring alignment angles, it is critical that the vehicle bumper height be correct. Measure and adjust bumper height according to the following procedure before performing alignment.

  1. Place vehicle on a level surface.
  2. Adjust tire pressure to correct specifications.
  3. Curb bumper height should be measured with:

    • 207 kPa (30 psi) tire pressure - front tires
    • 207 kPa (30 psi) tire pressure - rear tires
  4. If vehicle fuel tank is not full, the following chart may be used to determine amount of weight necessary to be added to the trunk of vehicle to simulate a full fuel tank.
  5.  - 1/8 Fuel Level (31.8 kg (80 lbs) to add
     - 1/4 Fuel Level (27.2 kg (70 lbs) to add
     - 3/8 Fuel Level (22.7 kg (60 lbs) to add
     - 1/2 Fuel Level (18.1 kg (45 lbs) to add
     - 5/8 Fuel Level (13.6 kg (35 lbs) to add
     - 3/4 Fuel Level (9 kg (20 lbs) to add
     - 7/8 Fuel Level (4.5 kg (10 lbs) to add
  6. Bounce front and rear of vehicle a few times to settle suspension.
  7. Measure front and rear vehicle curb trim height.

Locating point -Y and +Y is distance from the center line of vehicle according to the following chart.

Models

Front

Rear

All

390 mm (15.35 in.)

530 mm (20.86 in.)

Measure curb bumper height from ground to bottom horizontal surface of bumper.

Models

Front

Rear

All

395.3 +/- 25.0 mm

(15.56 +/- 0.98 in.)

386.4 +/- 25.0 mm

(15.21 +/- 0.98 in.)


Object Number: 892537  Size: MF