They are both different things, epoxy mod enables you to chose what gear 1-2-3/od manually and bauman is a shift improver kit that will firm up shifts.
For the aod there is only one thing you have to make, thats the cutback elimination part that blocks the channel for 3rd gear. I make mine from aluminum and epoxy it into place.
Drill a few holes and shim a few valves and you have a valve body that works very well. (I make all my own shims)