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Z Height Measurement

  1. By hand, lift the front bumper of the vehicle up about 1.5 in. (38 mm).
  2. Release vehicle.
  3. Allow the vehicle to settle into position.
  4. Repeat this 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 1.5 in. (38 mm).
  7. Release vehicle.
  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. See TRIM HEIGHT SPECIFICATIONS  .
Fig 1: Measuring Z Height
G00274026Courtesy of GENERAL MOTORS CORP.
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