D Height Measurement
NOTE:
The D height dimension measurement determines the proper rear end ride height. There is no adjustment procedure. Repair may require replacement of suspension components.
NOTE:
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 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.
- 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). See Fig 1 .
- 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 high and the low 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 .
- Collision damage.