I can set you up with a Twisted Diesel 5R110w with an unbeatable warranty. Twisted builds absolutely wicked transmissions. I've got one waiting in my garage for install right now.
Call BTS trans. But I would do billet input shaft, Billet intermediate shaft, od planetary housing and rear ring gear hub with reds and kolenes clutches. But who ever you decide to have build it can recommend what you would need.