Hi Anthony, welcome to MLMF.
I did a little poking around and found this on the John Deere Green Part store.
John Deere Complete Transmission Assembly- MIA10318
You might have already found this out, but if not, it might help in locating a transmission to replace yours since it was evidently used on so many different models.
"It leaked oil, and I got down on my hands and knees to smell it. It was like perfume."