I did not add any back in, I only had about 3 oz come out. I will be doing a transmission flush as soon I can find the best deal around. It was pretty nasty looking.Helpful video as my radiator failed as well at 176k. Took over a week for the OEM radiator to arrive which was annoying. Dealer said they needed 5 hours and $800 to install. Looks more like 2 hours or so to me?
Should we add any transmission fluid to the new radiator prior to install or is most of the fluid sucked back from cooler when engine shuts down?