Tranny

You pretty much just pull the valve body cover off, remove the filter, let it drain. You could pull the valve body out and let that drain as well, then put it together with a new filter.

The Chilton's manual will tell you exactly how to do this as well as the steps to take when filling the system back up.

If you're going to do that to it, might as well throw a shift kit in there too. I've got the TransGo kit, and love it - go with the stiffer 2nd gear shift to break the rear end loose!

Change the fluid every 30K miles.