Boy, I got a lot done today (at least it feels like I did)! My exhaust is installed, aside from the hanger(s), and it sounds good. I popped the cover off the shifter too, I pretty much busted it off the screws that I tried drilling out, but it already had a big crack in it. I still don't know how I'm supposed to take the shifter handle off though.
I also put the new drain plug on my trans pan (lower left corner):
It's not green, that's just the flash reflection. My previous paint job is kind of messed up though, but I didn't bother doing it again. The pan is now reinstalled and holding fluid, I'm gonna drain it once or twice to flush out some of the old, coolant-contaminated fluid probably tomorrow.
When I ran the car, I don't know that the water outlet was leaking anymore. Maybe it actually sealed up then, but the tank was still full afterward.