You also have another option besides a 4 link. We have been selling our Torque Arm conversion kit for the First Gens now for a few months and will have the Second generation kits available within the next couple of weeks. It is 100% bolt-on and does not require any welding or fabrication experience. They are available for 10 bolts and 12 bolts or you can order the kit with a HD custom Ford 9" if you want to upgrade the housing at the same time. If you are interested, you can view some pics of the First gen kit
HERE, Second gen pics coming soon!