D Height Measurement

The D height dimension measurement determines the proper rear end ride height. There is no adjustment procedure. Repair may require replacement of suspension components.

1. With the vehicle on a flat surface, lift upward on the rear bumper 38 mm (1.5 in).
2. Gently remove your hands. Allow the vehicle to settle into position.
3. Repeat the jouncing operation 2 more times for a total of 3 times.
4. Measure from the lower control arm rearward inner bushing bolt centerline to the rearward outboard bushing bolt centerline in order to obtain the D height measurement. See Fig 1.
5. Push the rear bumper downward to 38 mm (1.5 in).
6. Gently remove your hands. Allow the vehicle to settle into position.
7. Repeat the jouncing operation 2 more times for a total of 3 times.
8. Measure the D height dimension.
9. The true D height dimension number is the average of the high and the low measurements. Refer to TRIM HEIGHT SPECIFICATIONS .
10. If these measurements are out of specifications, inspect for the following conditions:
    • Improper weight distribution
    • Collision damage
    • Worn or damaged suspension components

Fig 1: Measuring D Height

Courtesy of GENERAL MOTORS CORP.