I am no help but when I was a teenager I threw my parent's 1970 383 station wagon (I think it was) accidently into reverse going maybe 30 mph as well. I was manually shifting the automatic shifter on the column (like an idiot). Don't know how I got it in reverse. Car came to a very quick halt! Pulse rate thru the roof on that one. Car seemed OK afterward, drove fine, and nobody ever said anything. To this day, I have never told anyone! So keep this quiet. : )