So last winter it got way colder that I thought it would in the deep south. As a result I blew out my thermostat gasket and my heater core. Repaired all of that and now I've got coolant in the trans fluid and vice versa. My radiator was new about a year ago. I hope it is only that, but I'm seeking advice from you gurus to describe other possibilities. Maybe seals or gaskets in the lines?

Any advice would be greatly appreciated. Except the advice to keep a proper level of anti-freeze in the system. Duh, I done already node dat.