4.56 should git 'r' done! I know most were geared 3.73 for the mileage, but there shoulda been an option here in Appalachia (probably the Rockies, too!) for 4.11's at LEAST in the beasts! I end up driving mine around in 4th, or with the tow/haul engaged most days, because I'm all hills/all the time, with stop signs thrown in every 5' for good measure! It's the only way she'll get OUT of her own way around here!