The 2011 through (I believe) 2014 F450 pickups were nothing but dumbed-down abominations compared to the 2008-2010 F450 pickups. No 19.5’s, no Dana S110 rear axle, no wide-track front axle, same brakes as F350. I couldn’t see any significant difference between them and the F350’s of the same model year.
If you want an F450, look for a 2015 or 2016. Ford went back to building the truck like the 2008-2010 models, except with some nice changes/upgrades and an improved version of the 6.7L Powerstroke. The biggest problem with the 2008-2010 F450 pickups was the same one every other Diesel powered truck of the same years had: they didn’t use DEF to reduce the oxides of nitrogen in the exhaust, so they used a massive amount of EGR. Didn’t work out well for any of the manufacturers.
As far as I’m concerned, the 2015-2016 F450 pickups are what the 2008-2010’s SHOULD have been, and the 2011-2014’s could NEVER be.
Major design changes starting in the 2017 Superduties, so I can’t speak to them at all.
:):)