I'm wanting to put a bigger tire and wheel on my truck. Stock was a 245. Now I have 265's and you know there's a problem when your wife tells they need to be bigger. (THE TIRES!!) The local Dodge dealer said if I go any bigger than 2 sizes above stock my trans would not lock-up properly. I'm going to go to 285/75's or 305/70's w/ 8" wheels at least and hope my power and milage is not effected to bad. Will the stock trans make it? Hope so!!