Appreciate the response everyone. I have pulled the transmission cooler and drained the trans oil. The oil was black but did not look like water was in it. I am dropping the cooler off after work to have it pressure tested before I continue. Does anyone know what the trans pressure through the cooler should be? The trans shop wanted to run 100 psi through it, but that seemed to high for me. I was thinking 20 psi tops.

The seller had no clue or pretended to have no clue. So I am on my own as far as that. If the trans does pass the pressure test, then I will clean everything out and watch everything on short trips. I like the UV dye idea, I will look into that.