As far as I know (not much) the folding prop will not fit the ServoCity 3:1 gearbox because that comes with the fittings for an APC prop. I have not yet installed my gearbox because they sent me the 1.7:1 instead (which I am keeping for fun!!!). The real challenge will be getting the brass gear off of the motor shaft. I really do not know what I am doing but I love the Scooter!