Leaf spring bushings stabilize the movement of the rear axle, inferior bushes in this area will cause the solid rear axle to move and impart rear end passive steer to the vehicle. This can be especially noticeable carrying a load or towing a boat or caravan. The OE rubber style bushes are designed to work at standard height with standard tires and with standard loads. By upgrading to SuperPro Leaf spring Bushes the improvement in ride and handling will be noticeable.