Found this on Dubberz
http://www.youtube.com/watch?v=jHWDSnWk2jUA Technic sequential gearbox is a challenge that I was always amazed with, and made me wonder whether it would be possible to build something reliable within a reasonable size range (or almost...). Thus it was with big satisfaction that I finally saw some solutions to raise.
The gearbox ratios achieved with this model from Sheepo, are:
