[ThreeQuarter]

Keep the suggestions coming—thank you!

I dropped the pan and changed the filter today. The dipstick looked right. I got 5 qts out of it.

But I do see some grime and moisture in the pan. Given that this transmission was supposedly in storage for some years before I bought it and had it rebuilt, is it possible this grime/moisture was inside the transmission and just now getting loosened up? I ask because my few experiences with leaks in the trans cooler showed up more as trans fluid in the coolant, and less as coolant in the trans. I don’t see any signs of trans fluid in the coolant. I’m not trying to say I don’t have a problem, but I want to make my best guess at the source of the problem before I do something like remove and re-test my radiator. (It was tested 2500 miles ago but of course it could’ve developed a leak 2499 miles ago.)