Quote Originally Posted by Zef_66 View Post
If you just caught it, then there is a good change that no coolant got in the tranny. But check the color and condition of the tranny fluid to be sure. And whatever you do, do not drive the car at all. In fact, do not even start the car! Replace the radiator, flush the coolant out, replace with new, drop the pan on the transmission, put in new filter and new fluid. Then have the trans flushed as soon as possible afterwards.
I could not agree more, do exactly this.

This happened on my camaro.