You need to check out DTT Performance. They've pioneered many of the advances made in transmissions for our trucks. Those include custom valve bodies, and billet parts. The critical thing with the internal components in transmissions is strict adherence to detail, clearances, and strength. Their function is to keep fluid pressure loss to a minimum so that power produced by the engine makes it to the rear meals. DTT'S customized build is what sets them apart. They are a family business well known for honesty and quality products. Their 800# is 866-504-4002. They will ask you questions about how you want to use your truck, i. e. , racing, street, towing, if towing how much weight is towed, etc. , and how your truck is currently set up. After asking the questions they will make some recommendations on what they think will best meet your needs, as well as additional options that you can consider. You can spend as much as you want, but they will actually be honest in their recommendations. They customize the valve body to meet your specific requirements. Check out their website and take a look at the parts going into the transmission and why their TCs, Valve Bodies, and Transmissions set them apart from other products. They are great about answering questions.
Good Luck, Skip