ReadyLift 66-2015 5" Rear Block Kit for Ford F250/350 Fits rear wheel F250 only will not work on dually Tough e-coated finish, new u-bolts and hardware, the perfect solution for towing and hauling; adds a slight rake for improved weight distribution Cast iron OEM-equivalent; cast in center pins; no dangerous pressed in pins; built in pinion angle degree; OEM bump stop landings Replaces factory block Designed specifically for the 2011 Ford Super Duty trucks