Thanks guys for all the advice and your opinions. I value all of them. What I've decided the best thing to do is, drain out all or as much of the old ATF as possible from everything and replace it with Dexron/Mercon ATF. At least then I'll know for sure what type ATF is in the tranny. I'll empty the pan, drain the converter, blow out the bottom tank on the radiator with some air, and replace the trans filter. Sounds like a lot of work just to replace a leaking pan gasket, but I don't want to take a chance on mixing different fluids together, and screwing up my transmission. Again thanks for everyone's help.