I am in the process of putting a Ford 9" and an HP d44 and am looking for some advice on doing a coil spring conversion in the front and a SOA in the rear. I have the whole truck as well so I have all the factory bracketry at my disposal. I heard that the factory radius arms do not flex well w/out modifying but I'm not to familliar w/ this. Any advice would be greatlly apprecciated.