Many people on the newer trucks go with the super duty front axles. They are a ball joint axle, but you can get hd rebuildable ball joints for them, free spin hub kits with regular hubs, retain your abs, and keep big brakes. Many go with the 77.5-79 f-350 dana 60 because it had a 32.5" leaf spring pad spacing and king pins, but many argue the ball joints are just as strong(just tend to not last as long). If it was mine, I would run a 05+ Ford super duty with coil springs and radius rods instead of leaf springs. They handle much better, turn sharper, clear bigger tires, have massive brakes, and retain abs.