When adjusting your CalTracs, be sure to have the suspension in a compressed state. Apply grease to outer diameter of bushing before installing.Using a press, install the CalTracs aluminum bushing. Apply grease or anti-sieze around surface of. Use the chisel and hammer, and tap out the center sleeve. Installing the CALTRACS is very straightforward. Raise and support the car high enough to remove the rear tires. Park truck on a flat work area, chocking the front tires is advised to avoid rolling. I dont think the rear of the spring has a rate, The front does, The rear is the ride height. This is on a 65 Plymouth, Caltracs.