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Z Height Measurement

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

  1. Lift the front bumper of the vehicle up about 38 mm (1.5 in).
  2. Gently remove your hands.
  3. Allow the vehicle to settle into position.
  4. Repeat the jouncing operation 2 more times for a total of 3 times.
  5. Measure from the pivot bolt center line (3) down to the lower corner (5) of the lower ball joint (1) in order to obtain the Z height measurement (4). See Fig 1 .
  6. Push the front bumper of the vehicle down about 38 mm (1.5 in).
  7. Gently remove your hands.
  8. Allow the vehicle to rise.
  9. Repeat the operation for a total of 3 times.
  10. Measure the Z dimension.
  11. The true Z height dimension number is the average of the high and the low measurements. Refer to TRIM HEIGHT SPECIFICATIONS (REAR)  and TRIM HEIGHT SPECIFICATIONS (FRONT)  .
Fig 1: Measuring Z Height
G00371785Courtesy of GENERAL MOTORS CORP.
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