Where do you measure from to adjust air ride suspension on a 359 peterbilt?

To adjust the air ride suspension on a 359 Peterbilt, you will need to measure from the ground to the bottom of the frame rail. The measurement should be taken at the front and rear of the truck. The difference between the two measurements will tell you how much the suspension needs to be adjusted.

To adjust the suspension, you will need to use a wrench to turn the air ride valves. The valves are located on the air tanks. To raise the suspension, turn the valves counterclockwise. To lower the suspension, turn the valves clockwise.

Be sure to adjust the suspension evenly on both sides of the truck. If the suspension is not adjusted evenly, the truck could be unstable.