Since part of the reason your thinking about this swap is that you want the ride quality of the 2013 then what I'd do is get both trucks side by side and take "all" the measurements from both trucks to see if the body swap is doable . Measure the wheel base , frame width and length , etc. . Also check out were your body mounts are going to be and figure out weather your going to have to move them or make them up . Some of the other things that your going to have to figure out is how your going to modify your inner fenders to make room for the coil springs in the front . The stock heater box might have to be worked or replaced as well , I'm not sure without seeing it first hand . ..... Quick question and please don't take this the wrong way . What's you mechanical ability ? Can you fabricate , weld , handle the electronics ? I only ask this just because weather it's just a drive tran swap or a body swap , neither one is a small or easy job and I've seen a lot of people start something like this and "then" realize they have gotten in over there heads .