D Height Measurement
WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
The D height dimension measurement determines the proper rear end ride height. There is no adjustment procedure. Repair may require replacement of suspension components.
- With the vehicle on a flat surface, lift upward on the rear bumper 38 mm (1.5 in).
- Gently remove your hands.
Allow the vehicle to settle into position.
- Repeat the jouncing operation 2 more times for a total of 3 times.
- Measure the D height by measuring the distance between the bumper bracket and the top of the rear axle tube.
- Push the rear bumper downward to 38 mm (1.5 in).
- Gently remove your hands. Allow the vehicle to settle into position.
- Repeat the jouncing operation 2 more times for a total of 3 times.
- Measure the D height dimension.
- The true D height dimension number is the average of the high and the low measurements. Refer to Trim Height Specifications .
- If these measurements are out of specifications, inspect for the following conditions:
- Sagging front suspension. Refer to FRONT COIL SPRINGS REPLACEMENT or TORSION BAR REPLACEMENT .
- Sagging rear leaf springs. Refer to LEAF SPRING REPLACEMENT .
- Worn rear suspension components, such as leaf spring bushings. Refer to SPRING BUSHING REPLACEMENT .
- Improper tire inflation.
- Improper weight distribution.
- Collision damage.