Trim Height Inspection

Trim Height Inspection Procedure

Trim Height Measurements
Trim height is a predetermined measurement relating to vehicle ride height. Incorrect trim heights can cause bottoming out over bumps, damage to the suspension components and symptoms similar to wheel alignment problems. Check the trim heights when diagnosing suspension concerns and before checking the wheel alignment.
Perform the following before measuring the trim heights:
1. Make sure the vehicle is on a level surface, such as a alignment rack.
2. Remove the alignment rack floating pins.
3. Set the tire pressures to the pressure shown on the certification label.
4. Check the fuel level. Add additional weight if necessary to simulate a full tank.
5. Make sure the rear compartment is empty except for the spare tire.
6. Close the doors and hood.

Z Height Measurement

Important: K models only the Z height must be adjusted before the alignment.

The Z height dimension measurement determines the proper ride height for the front end of the vehicle. Vehicles equipped with torsion bars use a adjusting arm in order to adjust the Z height dimension. Vehicles without torsion bars have no adjustment and could require replacement of suspension components.

1. Important: All dimensions are measured vertical to the ground. Cross vehicle Z heights should be within 12 mm (0.47 inch) to be considered correct.

Place hand on the front bumper and jounce the front of the vehicle. Make sure that there is at least 38 mm (1.5 inch) of movement while jouncing.
2. Allow the vehicle to settle into position.





3. Measure from the front pivot bolt center line (2) down to the lower corner (5) of the steering knuckle (1), do not measure to the ball stud or nut, in order to obtain the Z height measurement (4).
4. Repeat the jouncing operation 2 more times for a total of 3 times.
5. Use the highest and the lowest measurements to calculate the average height.
6. The true Z height dimension number is the average of the highest and the lowest measurements.

Z Height Adjustment





1. For vehicles equipped with a torsion bar suspension turn the bolt that passes through the torsion bar adjuster clockwise to raise the and counterclockwise to lower the height adjustment.
2. For vehicles without torsion bars, replace damaged or worn components as necessary.

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.

1. Important: All dimensions are measured vertical to the ground. Cross vehicle D heights should be within 10 mm (0.39 inch) to be considered correct.

Place hand on the rear bumper and jounce the rear of the vehicle. Make sure that there is at least 38 mm (1.5 inch) of movement while jouncing.

2. With the vehicle on a flat surface, lift upward on the rear bumper 38 mm (1.5 inch).
3. Allow the vehicle to settle into position.





4. Important: Measure the metal to metal contact points of the rear axle to the frame on the inboard side of the leaf springs.

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.
5. Repeat the jouncing operation 2 more times for a total of 3 times.
6. Use the highest and lowest measurements to calculate the average height.
7. The true D height dimension number is the average of the highest and the lowest measurements.
8. If these measurements are out of specifications, inspect for the following conditions:
^ Sagging front suspension
^ Sagging rear leaf springs
^ Improper tire inflation
^ Improper weight distribution
^ Collision damage