D Height Measurement
WARNING: This page is about a different car, the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
The D height measurement determines the proper ride height for the rear end of the vehicle. There is no adjustment procedure. Repair may require replacement of suspension components.
IMPORTANT:
All dimensions are measured vertical to the ground. Cross vehicle D heights should be within 12 mm (0.5 in) for vehicles equipped with coil springs, vehicles equipped with air suspension should be within 8 mm (0.3 in).
- Place hands on the rear bumper and jounce the rear of the vehicle. Make sure that there is at least 38 mm (1.5 in) of movement while jouncing.
- Allow the vehicle to settle into position.
- Measure the D height by measuring vertical distance (2) between the jounce bumper reinforcement bracket (4) on the frame (1) and the top surface of the axle tube (3).
- Repeat the jouncing operation and measurement 2 more times for a total of 3 times.
- Use the highest and lowest measurements to calculate the average height.
- The true D height dimension is the average of the highest and lowest measurements. Refer to Trim Height Specifications .
- If these measurements are out of specifications, inspect for the following conditions:
- Sagging rear suspension. Refer to Coil Spring Replacement in Rear Suspension or Symptoms - Air Suspension in Air Suspension.
- Collision damage.