Got a rad from Performance Radiator this morning. 24 gallons of trans fluid later, the trans is clean.
Here's what the last pan that I drained looked like
Dropped the pan and changed both filters after seeing the above fluid come out of it.
In case anyone wants to know what 24 gallons of fluid looks like
I have simple green and water in the cooling system right now, will finish flushing that tomorrow. Phew. I have not opened up the internal filter that I removed from the truck yet, but the pan was clean when I dropped it. There was a little bit of greasy feeling stuff on the magnet.