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thank you for the support
i lack the supplies and machines to try it, but i can offer a tip on how to disengage the first gear. i figure that if you had a one-way bearing, once the second gear kicks in, then the wheels will outspin the first gear pinion. dunno if that helps.
imagine a mountain bike. pedals catch the chain going one direction, but not the other. the pinioin will drive the axel, but when the axel gets to the high rpms in second gear, the first pinion will not be able to catch and will just spin in idle.
size is the only issue i see. most of the parts can probably be milled aluminum, which probably won't wiegh down the car THAT much.
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