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Z Height Measurement

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The Z height dimension measurement determines the proper ride height for the front end of the vehicle.
  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 this jouncing operation 2 more times for a total of 3 times.
  5. Measure the distance between the lowest point of the ball joint (2) and the center of the front side of the lower control arm mounting bolt (1), using the J 42854. 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 from both the right and left side.
  11. The true Z height dimension number is the average of the high and the low measurements. Refer to TRIM HEIGHT SPECIFICATIONS .
Fig 1: Measuring Z Height Distance Using J 42854
G00371745Courtesy of GENERAL MOTORS CORP.
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