The '81 F350 dump needs kingpins and finding another set of "coined" 16" wheels has been fruitless. I took the 16"s off the dump to use on the RV getting rid of it's 16.5" wheels. The 16.5's are on the dump right now to keep it rolling. So here is my question.. Can newer ball joint style I beams ('88 or newer) be swapped under the '81 easily? I can find donor trucks in that era allover. Swapping the rear axle will allow using the "non coined" wheels all the way around. Thoughts or suggestions???