Let's Make Robots!

Automatic transmission

I never thought i would be possible, but someone has actually made an automatic transmission out of Lego Technics.

The input shaft is connected through a pump to a valve that will change gears if the pressure gets high enough. Quite genious actually...

Here a direct link, but if you wanna see everything this guy has made, check http://legorides.simtv.co.uk/