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May I present my newest MOC: the Kenworth W900 US Truck. It has all the technical functions you'd expect from a supercar: * Full live-axle suspension on all axles * Both rear-axles are driven * Remote-controlled steering with working steering wheel inside the cabin * PF-lights (OK, I went a bit overboard with those 8-) ) * Openable hood and cabin doors * Remote controlled driving And the most important function of this model: 4-Speed remote-controlled gearbox The main design goal for this gearbox was to have a reliable and comprehensive gearbox with more than 2 gears. One thing that was very important was that the gearbox had to be able to handle a lot of torque. It had to be able to drive large Lego Technic models. Another aspect was that switching gears had to be very easy. First, the transmission itself is a 2-way transmission, where one has a different gear ration compared to the other. Then I develloped a kind of switching-logic, where 1 M-motor would be able to switch 2 driving rings, each in either direction. For this I used differentials, 24z clutch gears and an inverter-mechanism which uses a sliding worm-wheel. Instructions Full building instructions for the Truck are available here.