I have a firebird with a turbo 400 in it. I have torn into everything in the car except the transmission. I don't know a thing about them. It is leaking around the "range selector shaft" is the technical term for it. The shaft the shifter cable connects to. I was wondering how much of a job it is to replace the seal. Is it just an O ring that can replaced without tearing into the transmission? Any info would be helpful.