Joined: Aug 2009
Location: Colorado Springs
+1 on that...
Change it while you have access to a lift. I use Valvoline Dex/Merc ATF fluid. All my other fluids are Royal Purple, but I heard somewhere that the RP tranny fluid frothed or some crap. I don't exactly recall what the problem was with it, but it bugged some people, so I just used normal tranny fluid.
Read your owners manual and it will tell you what type and how much you need, because I don't recall off the top of my head.
BTW, I didn't have any fluid leak out of mine when I did this. It's pretty easy.