Leaf springs
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what kind of truck do you have? 37's are alot of tire for a 4 inch even on a 350, i would go with a 6 inch on a 350 and you would fit with little or no bumper mods, but thaat would really fill the truck wheel wells up, on a 250 it could go with a 6 inch but would not like going offroad, i run a 6 inch on 35's right now and that is the perfect combo, i could put 37's on it now but the bumper would have to go forward a good bit and i gurantee they would hit really bad if i twisted it up bad