Thanks Guys. I knew 35's would fit from reading threads on forums and the Autonomous F350 thread by Pappawheely is running 37's on pretty much the same truck. The story on the wheels is I must have looked at 3000 different wheels and nothing really appealed to me. Then I saw these and really liked them. They also come in a Gun Black that I preferred but those were 45 days out. So we got these and figured if they don't look right we'll Plastidip them another color that does.
They come in 2 offsets, 6mm and -18mm and 3 diameters, 17, 18, and 20 all 3 are 9.5" wide. I did the math and figured the -18mm would work out. I test fit them before mounting the tires and the rears look like I'll have about and inch between the sidewall and the airbag. The fronts should be OK too as they clear all the vitals. I'll be building a new front bumper at some point so I can gain clearance there if its needed. As far a 37's go I have mixed feeling about big tires and going to 35's on a truck like this was a big step for me. In a previous life I was a mechanic so I tend to see things from a what's going to happen point of view. I'm gonna lose some power and fuel economy and I've already started the hunt for a Dana 60 front axle to replace the 50 that these tires are sure to kill. I'll post some pictures as soon as I get em' on the truck.