2001 Mitsubishi Montero Sport transmission

My transmission was changed out last year but when I was towing I hit black ice at 80 SUV got whipped around really could and went sideways in the ditch. But now I’m at my spot and unhooked it drove fine one day all over the place no problem but next day got it in Drive but dash is blinking N but is driving in low gear. Can someone help me out?

Yes, take it to a good independent transmission shop (not AAMCO).

Talk about asking for trouble .