Alright, I've tried multiple approaches here. Bigger hammer, bigger pry bar, bigger stick, etc. Still no luck with this thing. I can't understand what's holding it on there at this point. It has slop in it, the shaft coupling wiggles slightly on the shaft. It just won't come off of there.
Thanks for the suggestions, I will try again in a few days when I have some more garage time to play with. I tried getting the tool from AutoZone, but they said they didn't have one. Thanks to bruhaw's photo gallery now I've got their part number and can go back in there and get the right tool! Hopefully that will make this a little easier.