Z Height Dimension Measurement Procedure

The Z height dimension measurement determines the proper ride height for the front of the vehicle.

1. Use your hands in order to lift the front bumper of the vehicle up approximately 38 mm (1.5 in). Gently remove your hands in order to allow the vehicle to settle.
2. Use your hands in order to push the front bumper of the vehicle down approximately 38 mm (1.5 in). Gently remove your hands in order to allow the vehicle to settle.
Fig 1: Measuring From Center Line Of Front Axle & Front Lower Control Arm Front Bolt To Ground
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Measure all dimensions vertically.
3. Measure from the center line of the front axle to the ground (a).
4. Measure from the center line of the front lower control arm front bolt to the ground (b).
5. Calculate the difference between the measurements (Z = a-b).
6. Compare the measurement (Z) to the specification. Refer to Trim Height Specifications .
7. If the measurement is not within 10 mm (0.4 in) of the specification, replace the front springs. Refer to Strut, Strut Component, and Spring Replacement .