Working Car Drivetrain Model - 4-Speed + Reverse Gearbox, H-Shifter, Bevel Open Differential

A working cutaway model of a car drivetrain that you print yourself: a 4-speed + reverse constant-mesh gearbox with an H-pattern gear lever, a propshaft, and a bevel ring-and-pinion open differential driving two half-shafts with wheel hubs. Turn the crank (or fit the optional N20 gear motor), move the lever through R, 1, 2, 3 and 4 and watch the sliding dog sleeves lock each gear to the main shaft. Hold one wheel hub and the other turns twice as fast: the spider gears show why a car can drive r…

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