Curb Height Measurement

The wheel alignment is to be checked and all alignment adjustments made with the vehicle at its required curb height specification.

Vehicle height is to be checked with the vehicle on a flat, level surface, preferably a vehicle alignment rack. The tires are to be inflated to the recommended pressure. All tires are to be the same size as standard equipment. Vehicle height is checked with the fuel tank full of fuel, and no passenger or luggage compartment load.

Inspect the vehicle for bent or weak suspension components. Compare the parts tag on the suspect coil spring(s) to the parts book and the vehicle sales code, checking for a match. Once removed from the vehicle, compare the coil spring height to a correct new or known good coil spring. The heights should vary if the suspect spring is weak.

Fig 1: Jounce Bumper Cup/Axle Striker Plate (4x2)

Courtesy of CHRYSLER GROUP, LLC

1. Front 4X2  On each side of the vehicle, measure the distance from the rear side of the jounce bumper cup/axle striker plate (1).
   Fig 2: Jounce Bumper Cup/Axle Striker Plate (4x4)

   Courtesy of CHRYSLER GROUP, LLC
2. Front 4X4  On each side of the vehicle, measure the distance from the rear side of the jounce bumper cup/axle striker plate (1).
   Fig 3: Curb Height Measurement (HD) - Rear

   Courtesy of CHRYSLER GROUP, LLC
3. Rear - On each side of the vehicle, measure the distance at the top of the axle tube (2) to the bottom of the frame rail (1).
   Fig 4: Curb Height Measurement

   Courtesy of CHRYSLER GROUP, LLC
4. Rear Air Suspension - On each side of the vehicle, measure and record the distance (B) from the bottom of the frame to alignment rack/lift runway surface. It may be necessary to measure to the bottom of a straight edge placed from lift runway to runway, to get an accurate measurement.
   • On each side of the vehicle, measure and record the distance (A) from the center of the rear spindle to the same surface that was used to measure from the frame.
   • Subtract the frame height (B) from the spindle height (A) to obtain the curb height value (C). Compare the curb height value (2) to specifications listed in the following CURB HEIGHT SPECIFICATIONS chart. Maximum left-to-right differential is not to exceed 10 mm (0.39 in.).
5. Rear- ALL  Compare the measurements to the specifications listed in the following Curb height Specifications chart.