Transgo -2 usually retains the automatic shift functions of the stock valve body, but improves the shifts. There should be a "shift command" option if it's a Chrysler transmission, but I dont' think it's needed on the Ford and Chevys.
If the "Stage 2" is referring to the transmission you're on your own. It's probably some BS a trans shop or company uses to describe their pricing options.
Transgo is a brand of shift kit, basically it makes your transmission shift harder.
The stage thing will depend on where the trans was built, and all companies are different, so there's no way to know for sure. Usually it goes from a stock rebuilt trans ,to a strip/street build, to a full out race build, and sometimes more in between those.