you are better off to get the trans over built than under built and have to spend the money again when you start upgrading the engine. even my buddies truck really isn't too done up power wise. i think it is only about 300hp which is only about 100hp more than stock but he is turning 37's so the power is not too noticeable but the increase in torque and throttle response is pretty noticeable. the worst part is he has another new turbo/set of injectors to go in and the old ones haven't even been in the engine 2 years lol.