I pull my signature 5er with a 2001 F250. I have, over the years, made a few mods to the truck. A 6.0L tranny cooler is a must. You are in So Cal only a couple hundred miles from John Wood. He is in Holtville near El Centro. He builds Tow Master trannies for the 7.3. With that trannie and his billet triple disc torque converter the old truck will be good for many years.