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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 903 (Suspension General Diagnosis) >> Diagnostic Information and Procedures >> Trim Height Inspection >> Measuring the Z Height

Measuring the Z Height

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: For vehicles equipped with torsion bars, the Z height must be verified before the alignment.

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.

    IMPORTANT: All dimensions are measured vertical to ground. Cross vehicle Z heights should be within 12 mm (0.47 in) to be considered correct.
  1. Lift the front bumper of the vehicle up about 38 mm (1.5 in).
  2. Gently remove your hands and let the vehicle settle.
  3. Repeat this operation 2 more times for a total of 3 times.
    4. Fig 1: Z Height Measurement
    GM1764721Courtesy of GENERAL MOTORS CORP.
  4. Set the top edge of the level on the reference surface of the steering knuckle (C) and extend the level directly under the rear end of the front attachment bolt of the lower control arm (A).
  5. While keeping the level in contact with the knuckle reference surface, adjust the level up/down until the bubble indicates it is horizontally level.
  6. Extend a tape measure straight down from the center of the attachment bolt. The point where the tape measure and the level intersect is your first measurement.
  7. Keep the top edge of the level on the reference surface of the steering knuckle (C) and move the level directly under the front end of the rear attachment bolt of the lower control arm (B).
  8. Extend a tape measure straight down from the center of he attachment bolt. The point where the tape measure and the level intersect is your second measurement.
  9. Push the front bumper of the vehicle down about 38 mm (1.5 in)
  10. Gently remove your hands and let the vehicle settle.
  11. Repeat this operation 2 more times for a total of 3 times.
  12. Re-measure the Z height.
  13. The true Z height is the average of the measurements taken. Refer to Trim Height Specifications . If any of these measurements are out of specifications, inspect for the following conditions:
    • Worn or damaged suspension components
    • Collision damage
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