Put on that old T-shirt with the has-been rock band on it and slide on under so you can change your transmission fluid. We're going to show you how to drain the old oil, and how to install a drain plug if your tranny pan lacks one. The truck we worked on had just been rescued from the want ads, so we didn't know what we'd find--no fluid or fluid that desperately needed to be changed.
To do the drain, you'll need a screw-driver, a socket and wrench set, a new filter, and a pan to catch the oil. You might also need a new gasket. If you're adding a plug, you'll need a plug kit, a drill, and a file.