Tranny problem after replacing radiator

I have driven it for a few miles testing it and now I just got home and coolant started to spill everywhere. The temperature gauge wasn't even indicating it was overheating. I checked the tranny fluid levels and they were fine. UPDATE 10/16: I took it back, a mechanic checked and not only did it have the codes I mentioned it had some additional codes which turned out to prove that one of the RPM input sensors had been unplugged. Now tranny is working normally, again!

Thanks for the response! Glad they fixed it !

I drove the car over and dropped it off. I'll call them once they open and let them know about this. I just hope I didn't cause any damage by driving it around. I tried to go really slow and took the main road instead of the highway and even then I could start to smell to like burned coolant.