Ride/Trim Height Measurement and Adjustment

Description
Trim height can be described as predetermined measurements relating to the vehicle's ride height. Incorrect trim heights can cause symptoms similar to alignment problems. Trim heights should be checked when diagnosing steering and vibration complaints.








"Z" Height
The "Z" dimension is a measurement to determine the proper front end ride height. The "Z" dimension is different between RWD vehicles, and 4WD or AWD vehicles.
All "Z" heights to be trimmed at 73.0 ± 6.0 mm (2.8 ± 0.2 inch).








These vehicles require a measurement from the center line of the pivot bolt down to the lowest inboard edge of the knuckle.
All Curb "Z" Heights to be trimmed at 122.0 ± 6 mm (4.8 ± 0.2 inch).
To adjust, turn bolt that contacts the torsion arm as needed. One revolution of bolt into nut increases "Z" height by 6.0 mm (0.2 inch).





Measure
1. Lift the front bumper of the vehicle up about 38 mm (1.5 inches).
2. Gently remove your hands and let the vehicle settle on its own.
3. Repeat the jounce operation two more times for a total of three times.
4. Measure the "Z" dimension.
5. Push the front bumper of the vehicle down about 38 mm (1.5 inches).
6. Gently remove your hands and let the vehicle rise on its own.
7. Repeat the jounce operation two more times for a total of three times.
8. Measure the "Z" dimension.
9. Find the average of the high and low measurements. This is the true "Z" dimension.

Important: True Trim height is the average of the high and low measurements.





"D" Height
The "D" dimension is a measurement to determine the proper rear end ride height.
There is no adjustment procedure and repair could require replacement of suspension components. All vehicles require a measurement from the bumper bracket down to the top of the rear axle housing tube.
Utility "D" height to be trimmed at 130.8 mm to 148.11 mm (5.1 inch to 5.8 inch)
Pickup "D" height to-be trimmed at 130.7 mm to 161.5 mm (5.1 inch to 6.4 inch).

Use the same jounce procedure on the rear bumper as used in the finding the "Z" height.





Measure
1. Lift the rear bumper of the vehicle up about 38 mm (1.5 inches).
2. Gently remove your hands and let the vehicle settle on its own.
3. Repeat the jounce operation two more times for a total of three times.
4. Measure the "D" dimension.
5. Push the rear bumper of the vehicle down about 38 mm (1.5 inches).
6. Gently remove your hands and let the vehicle rise on its own.
7. Repeat the jounce operation two more times for a total of three times.
8. Measure the "D" dimension.
9. Find the average of the high and low measurements. This is the true "D" dimension.

Important: True Trim height is the average of the high and low measurements.