[OverAllComa]

Someone who owns/has owned a 2nd gen standard tranny can give a better guarantee, but there should be a tube to pour tranny fluid in somewhere in the engine bay. I believe it uses some grade of motor oil, check your manual and it should tell you.

As for a gas leak, you should check all your lines first, as that's where the leak is most likely to occur. If you need to swap a gas tank, you have to disconnect the lines and then unbolt the tank from under the car. Not terribly complicated, just rather time consuming. As for sourcing the gas tank, I'd say you should hit up a junkyard.