At the top of our Super Duty line is our famous bolt-on 4 Link System that provides unsurpassed articulation and wheel travel. These 2″ diameter heavy wall links feature race style 1″ Uniballs for superior strength. Thick 1/4″ steel brackets secure the 4 Links to the frame without cutting or welding. This 4 Link system is comes complete with our replacement Coil Springs, Sway Bar drops, Pitman Arm, rear Block & U-Bolt kit, and the choice of Fabtech’s Dirt Logic Shocks or you can also choose to upgrade the front end with our coilover conversion and massive Dirt Logic 4.0 resi shocks.