2.5 Ton Rockwell Axles are a great choice but to get the most out of them you need suspension components that are uniquely designed for their unique layout. First to keep the center of gravity low and to have clearance for the top loader drive shaft the upper control arms need to be straight. Since the upper control arms are straight then to locate the axle laterally the lowers then need to have the triangulation so they are pre-bent to 20 degrees. We took this in to consideration with the design of all of our Rockwell brackets. The entire Barnes 4wd Rockwell Bracket line up is made entirely of 3/8" American Steel and to be used the suspension joints that have a 2 5/8" mounting width.