04. The new front differential mount (the old one must be cut off) is shaped like a boomerang and bolts to the aluminum case and then to the subframe with a new urethane bushing. When removing the five bolts from the differential case some oil may leak out. If it does be sure to check the fluid level when the truck is back on the ground and add any if necessary. Depending on how your HD truck is equipped from the factory you may or may not have a steering stabilizer. Rancho offers an optional unit that will bolt up to the frame and factory centerlink if your truck didn't come with one.