Awesome! Now i definitely need to stop by and check your truck out. It will help me out big time to see how it all fits. These guys sell "conversion kit"
here about .625 down the page.
But I have a buddy who is a tranny guy (haha) at GM and he said all i need is 29544368 "extension" housing and 19260884 "gear" together those are $189 (you might need gasket and seal) through gm parts direct. He also said i would have no problem taking the whole trans down to swap the shaft. I have no clue if this is true, he said the only part that is hard is that there is a beast of a snap ring in the center support that requires the mother of all snap ring pliers (3' handled). he says its like a 2 hour job and its Way easier than the 4l80s and 4l60s to empty. But like i said this is hear say and im not sure. But i will find out soon hahaha.