silver goop is a sign of friction disc and metal wear, its pretty common on a tranny that hasnt been serviced. I'd clean it out, change the filter and fluid, if theres a sump screen on the return hose at the bottom of the tranny i'd take that out and clean it too.

BTW... how much silver goop are you talking about? Just a film in the bottom or is it alot?

Then put her back together and fill it up and hope for the best, it may just come back to life. Lets just hope so anyways.