D Height Measurement
The D height dimension measurement determines the proper rear end ride height. There is no adjustment procedure. Repair may require replacement of suspension components.
- Place hand 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.
- With the vehicle on a flat surface, lift upward on the rear bumper 38 mm (1.5 in).
- Allow the vehicle to settle into position.
- Measure the D height by measuring the distance between the bumper bracket and the top of the jounce bumper pad on the rear axle tube.
- Repeat the jouncing operation 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 number is the average of the highest and the lowest 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 (Anchor) or Torsion Bar Replacement (Bar) .
- Sagging rear leaf springs-Refer to Leaf Spring Replacement .
- Improper tire inflation-Refer to Label - Vehicle Certification, Tire Place Card, Anti-Theft and Service Parts ID .
- Improper weight distribution
- Collision damage
IMPORTANT:
All dimensions are measured vertical to the ground. Cross vehicle D heights should be within 10 mm (0.39 in) to be considered correct.
IMPORTANT:
Measure the metal to metal contact points of the rear axle to the frame on the inboard side of the leaf springs.