Using a tranny that hasn't been run in 2-1/2 years
I'm considering using my parts car transmission instead of my daily driver transmission during an engine swap ('87 300D 279Kmi & '87 300D 175Kmi). The daily driver was run up until 2 months ago until a deer hit it. The trans is original, 280Kmi, and does not leak, never been opened/rebuilt. It clunks into gear but I think that's a modulator setting. Because it works and doesn't slip I've left it alone.
The parts car was last known to be working and all parts of the car appear in good/great condition. The trans pan was clean and no leaks detected. But it hasn't been used in 2.5 years.
I am wondering what the chances are that the 2.5 years of sitting will have dried out seals, etc that will show up soon after I install in my daily driver?
Or in other words, what are chances that I'll install this parts car trans and have to pull it and reinstall my original trans?