If you were close to my area I'd be happy to take a look for you. I am gonna recommend you don't change the fluid. With that many miles, and never being serviced, you'll do more harm than good. Especially in transmissions you cannot change the filter. New ATF is very high in detergent and will wash all the grit and grime that's within the trans and more than likely plug the filter. Then you're screwed. Car wont move.
Just my
Just my