'You really have not established a need to change the trans yet at all.'
'No logic stream there at all to arrive at that decision.'
'You should know that many of these cars go down permanently because of trans problems. Meaning that the odds are high of getting a yard trans that is in worse shape than yours.'
All WERE pieces of advice.
Dude, if I thought someone was about to waste a lot of cash on replacing something which might not even be broken, I'd call him out. Now if you are determined to just insist on what you are about to do with no more careful thought than what you've already displayed, then by all means do it. There are plenty of places out there that will rip you in a minute with the knowledge you display and you have not a clue how they will be doing it. I watch young people like you come into my store and spend hundreds of dollars uselessly every day on things they have managed to convince themselves are bad on the car. Things that I could figure out were not the trouble when I was like 12 years old. Then they come back in a few days asking for money back after parts are installed and problem still there. I generally try to steer them toward a practical solution early on, but testosterone output like you just displayed gets in the way and bad choice made. Needless to say, they do not get their money back. I daresay, neither will you. Tread carefully here................that's more advice, if you can figure it out.
Hint. The last time some 'namebrand' tranny shop told me I needed a new trans, I fixed it for the price of a 40 cent washer, trans lasted for 10 more years.