1992 ford conversion van shifting hard

Went to a transmission shop and talked to a guy with 35 years experience who sounded knowledgeable. Seemed to say a lot of what I searched on the internet. This vintage ford had some know problems from over heating and seals because there is no trans cooler. Bottom line it is a 92 with 200k miles, and the guy said he would have to drop the trans and could be a $2000 bill. He recommend to fill the trans when it cooled and if there was no leak it was probably a seal if not it would be something more severe. However when we tried this it just pour out the bottom. So had it towed to my sons house to sell it for parts. Thanks for the replies and help.