I couldn't upload a video here so I got it posted here instead - http://www.youtube.com/watch?v=dkRdXji30Fo
I built this Automatic Transmission because I needed a new chalange. So I sat down and did a little research. I found two ways to do it. I could make a big flywheel that shifted up when I spun fast enough or I could use a series of differentual that when there was to much pressure released a rubber stop to shift down. I combinded to two Ideas and got this.