Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
You need to purchase new wheels, 2 front, 4 rear, 1 spare, 2 front wheel spacers, bed fender skirts. Most F250's have a Ford 10.5 rear axle and DRW F350's have a Dana 80. There is a Ford rear axle DRW option. You will need to replace the rear hubs and rotors.
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