thanx guys.i also have a 2003 f350 ford and its also a 4 door long bed.the f350 has 8" lift,38.5 tall tires and i regeared it with 4.56`s. im getting better gas milage with the ford.im assuming because of the lift of the ford, i dont get the wind drag that the dodge is getting. the issue with the ford is i dont want to have 1 of those tires blow out at 70 mph.