I have an 01 2500 CTD and the tranny is fine now. I have it's a lot cheaper to do some mods to it now rather than when it's slipping. Planning to add a geoerend TC and valve body. I'm not really set on the brand but people on the cummins seem to think highly of them. Besides an obvious cooler and guages, what would be good to replace while the tranny is out. I have school with a guy who broke his back wroking for the dodge place in wilks. He is going to help with the tranny work.