From CalTracs Website.....Calvert Racing’s patented CalTracs combines the best of both systems. It connects from the rear axle to a triangular-shaped bracket mounted to the front leaf spring eyelet. The lower hole in this triangle bracket attaches to the new bar, the center hole is aligned with the leaf spring eyelet and the top hole has a pin through it that will ride on top of the leaf spring pack. As you throttle, the axle will have a tendency to wrap, which will push the Calvert Force Transfer Link forward. The pivot at the front leaf eyelet then forces the pin riding on top of the springs downward into the spring pack itself. This downward force of the pin on the leaf springs causes down force on the entire axle assembly and pushes your tires down onto the pavement/dirt. The harder you’re on the throttle, the harder the downward force on your tires.