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:
Important: Torsion bar 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.
Important: All dimensions are measured vertical to the ground. Cross vehicle Z heights should be within 12 mm (0.47 in) to be considered correct.
Important: There are no specified trim heights specifications on leaf spring vehicles because it is not an adjustable feature. The height of the suspension will depend on the option content of the vehicle as well as the aftermarket equipment that is placed on the vehicle. The measurements are used for comparison only and should be within 15 mm with the vehicle at curb and no accessories.
Important: Measure the metal to metal contact points of the rear axle to the frame on the inboard side of the leaf springs.
• | Sagging front suspension--Refer to Front Coil Springs Replacement or Torsion Bar Replacement . |
• | Sagging rear leaf springs--Refer to Leaf Spring Replacement . |
• | Improper tire inflation--Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label . |
• |
• | Improper weight distribution |
• | Collision damage |