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This 2 speed automatic gearbox design uses a worm gear for torque detection and gear switching combined. Some of my previous 2 speed automatic gearboxes have used a differential for torque detection to drive an orange rotary catch to switch gears using a switch component. The worm gear switches gears by disengaging one path to the input differential, thereby reducing the overall gearing ratio. In this 2 speed gearbox design the output gearing ratio is halved when switching from gear 1 to gear 2. By disengaging the 2nd path, the efficiency of the lower gear is improved due to the simplification of the gear train reducing the friction and power losses in that path. The overall power of the Lego technic automatic gearbox is demonstrated by testing it against a ten level torque generation device, as well as using a rubber band pulling instrument to measure the output pulling force for both gears. Hope you like it.