LEGO MOC 12 Speed Gearbox by TechnicBrickPower | Rebrickable - Build with LEGO
Behold the working 6-speed gearbox made of Legos
6 SPEED LEGO ENGINE SHIFTS GEARS | Listen to the roar of this 6 speed LEGO engine as it shifts gears! Gearbox design by Dgustafsson13 https://bit.ly/2OFnN83 Video by Mad Brick... | By