75 Duster Neutral Safety Switch... I need to replace it!

It was leaking when the front end was up to look at the bearings.... I saw the fluid leaking out the back of the pan and instantly knew it was tranny. He said it's only leaking because it was tilted... but since then I have seen it more often. I could see where it was leaking from... but wasn't under the car. Just wondering what needs to be done to fix this. Thanks all in advance!!!