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Z Height Measurement

The Z height measurement determines the proper ride height for the front end of the vehicle. Vehicles equipped with torsion bars use an adjusting arm to adjust the Z height. Vehicles without torsion bars have no adjustment and could require replacement of suspension components.

NOTE: All dimensions are measured vertical to the ground. Cross vehicle Z heights should be within 12 mm (0.47 in) for all vehicles except pickups with options QZ8 and V4A to be considered correct. Pickups with options QZ8 and V4A should be 0 mm to be considered correct.
  1. Place hand on the rear bumper and jounce the rear of the vehicle. Make sure that there is at least 38 mm (1.5 in) of movement while jouncing.
  2. Allow the vehicle to settle into position.
  3. Measure from the pivot bolt center line (2) down to the lower corner (5) of the steering knuckle (1) in order to obtain the Z height measurement (4).
    Fig 1: Z Height Measurement
    G00357796Courtesy of GENERAL MOTORS CORP.
  4. Repeat the jouncing operation 2 more times for a total of 3 times.
  5. Use the highest and the lowest measurements to calculate the average height.
  6. The true Z height dimension number is the average of the highest and the lowest measurements. Refer to TRIM HEIGHT SPECIFICATIONS .
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