I have 97'' F-150 4x4 with a 6'' Fabtech. I bought 35/12.50/16
super swamper radials (SSR) mounted on 16/10 rims. The reasion why I ask this is because the 35''s look a little small, I should be able to fit 37''s (SSRs) it would seem like. Anybody have anything like this. I wish I knew somebody with 37''s around me so I could slip them on......that would solve my whole tire issue I'll try to get some pictures of my truck this week and post them on here

 

You should be able to go to any tire store and tell them what you want. They will put on the size you are interested in to see if they will fit for you or not.

 

i have a couple of friends with fabtech 6" and a 3" body, one has 37s and the other has 38.5 both swampers so i don't know the "ACTUAL" sizes but to fit 38.5s he had to crank the bars and put a bigger block in the rear. so you may have to get technical with the "ACTUAL" tire sizes since they don't always measure what they are advertised for.