Ars FX swing arms are designed to give maximum amount of wheel travel when paired with our linkages. They are built from high strength 4130 Chromoly tubing then boxed, and gusseted with Chromoly plating. They are the industry standard endorsed by 8 time GNCC champion Bill Balance. You have to run our shock or a shock that is capable with an Eyelet so that it can be mounted with our 5.3 Linkage. It will not work unless you have our linkage or shock.