D Height Dimension Measurement Procedure

The D height dimension measurement determines the proper ride height for the rear of the vehicle.

1. Use your hands in order to lift the rear bumper of the vehicle up approximately 38 mm (1.5 in). Gently remove your hands in order to allow the vehicle to settle.
2. Use your hands in order to push the rear bumper of the vehicle down approximately 38 mm (1.5 in). Gently remove your hands in order to allow the vehicle to settle.
Fig 1: Measuring From Center Line Of Rear Wheel & Rear Suspension Lower Control Arm Rear Set Bolt To Ground
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Measure all dimensions vertically.
3. Measure from the center line of the rear wheel to the ground (d).
4. Measure from the center line of the rear suspension lower control arm rear set bolt to the ground (c).
5. Calculate the difference between the measurements (D = d-c).
6. Compare the measurement (D) to the specification. Refer to Trim Height Specifications .
7. If the measurement is not within 10 mm (0.4 in) of the specification, replace the rear springs. Refer to Coil Spring Replacement (All Wheel Drive and GT) or Coil Spring Replacement (Except All Wheel Drive and GT) .