After seeing the Shift-on-the-fly TechnoKat Gearbox I was inspired to see if it was possible to create one using LEGO. And of coarse it turns out that you can! (What can't be built with LEGO?

)
Below are two pictures of the gearbox. The first one shows the shifter in high gear and the second in low.
http://www.brickshelf.com/gallery/Rl...ifter_high.jpg
http://www.brickshelf.com/gallery/Rl...hifter_low.jpg
Please note that the gearbox can and will be built much more compact. I wanted to keep it spread out so I could easily show everyone how it worked.
Please post any questions or comments.