The Barnes 4WD Pro Series Jeep JK Dana 44 Rear Axle Trusses are made from a combination of 1/4" and 3/16" Ultra 100 steel to keep them light but incredibly strong. This truss is made to be a precise fit to the Jeep JK rear Dana 44 (Rubicon or Standard) but can be modified to fit other rear Dana 44's. If you are four linking your rig this truss is designed to give you as low of a mounting point as possible for your upper links.