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On a solid-axle vehicle, the ratio of the front roll stiffness to the rear roll stiffness should be 75 percent rear and 25 percent front. To stiffen up the rear of the car, MMS recommended an 8-inch-tall, 2.5-inch diameter, 225-pound spring and a stiff, 1.25-inch hollow sway bar. Too stiff a spring makes the car unstable and reduces the grip of the tires on a bumpy track. That’s why MMS recommended both the sway bar and this spring working together.