D Height Measurement
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
All dimensions are measured vertical to ground. Cross vehicle Z heights should be within 12 mm (0.47 in) to be considered correct.
IMPORTANT:
For leaf spring suspensions measure the metal to metal contact points of the rear axle to the frame on the inboard side of the leaf spring.
IMPORTANT:
For coil spring suspensions measure the distance between the edge of the jounce cup along the jounce bumper center line and the jounce pad on the rear axle.
- Lift the rear bumper of the vehicle up about 38 mm (1.5 in).
- Gently remove your hands and let the vehicle settle.
- Repeat this operation 2 more times for a total of 3 times.
- The D height is obtained by measuring the distance between the edge of the jounce cup along the jounce bumper center line and the jounce pad on the rear axle.
- Lift the rear bumper of the vehicle up about 38 mm (1.5 in).
- Gently remove your hands and let the vehicle settle.
- Repeat this operation 2 more times for a total of 3 times.
- Re-measure the D height as in step 4.
- The true D height is the average of the measurement from step 4 and step 8. Refer to Trim Height Specifications .
- If these measurements are out of specifications, inspect for the following conditions:
- Sagging front suspension-Refer to Torsion Bar and Support Assembly Replacement (Bushing Style) .
- Sagging rear leaf spring-Refer to Leaf Spring Replacement .
- Improper tire inflation-Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label .
- Improper weight distribution
- Collision damage