do you know how high your frame is from the ground on 37s i just put 38s on mine from 37s and didnt have to do much trimming my tires sit a full 38 with 20psi to the only trimming i did was the fronts and a little on the seem of the firewall. My frames at 25 with 7psi in the tires and with the 37s with 20 it was like 25 and a half ish