Eaton ultrashift to manual conversion?

I wish it was that easy, but its not. The main transmission case is different between the ultrashift and manual transmissions, and a case is not cheap, your better off just buying a whole manual transmission if that's what you want.
For the autoshift/ultrashift cases they skip the machining processes that are needed to finish out a case for the manuals shift.

 

If you’re handy enough to be thinking about swapping the top of the tranny you can probably handle replacing the gear or sliding clutch that’s bad….it’s a decent amount of work but possibly only a couple hundred bucks in parts… or maybe the whole inside is trashed from the shrapnel