D Height Measurement

Courtesy of GENERAL MOTORS COMPANY

Measurement Definitions 

D Height: The vertical distance (D) between the center of the rear suspension lower control arm inner bolt (2) to the center of the rear suspension lower control arm outer bolt (1).

Use the following procedure to check the D dimension:

NOTE:

The left and right D height difference should be no more than 10 mm (.39 in).

1. Push the rear bumper down a minimum of 25 mm (1 in). Perform this step three times.
2. Measure and record the trim height per the "Measurement Definitions" above.
3. Lift the rear bumper up a minimum of 25 mm (1 in), and release. Perform this step three times.
4. Measure and record the trim height per the "Measurement Definitions" above.
5. The true D height is the average of the measurements taken in steps 2 and 4. Trim Height Specifications 
6. If these measurements are out of specifications, inspect for the following conditions:
   • Worn or damaged suspension components
   • Collision damage