I've got 2 th350s one in a 82 T/A and one in a 93 T/A. Someone rigged it up out of a chevy truck. Anyway I'm in need of one for my 80 T/A but these things have been sitting for a while. The 82 probably 4ish years and the 93 close to 2. What are the odds these are still good transmissions?

 

I wouldn't be worried if they were sitting for 20 years.

 

Agreed; shelf life is, more or less, indefinite.

As to whether either of those is "still" "good", that would depend on any number of factors, none of which includes how long they've been out of cars.