The main gearbox is responsible for driving the main and tail rotors. To complete the main gearbox you will need to select a gear with the appropriate number of teeth to match your clutch, and also a gearbox connection which mates with your existing tail rotor drive system.
Main gearbox, kit-form. The pinion shaft 41/25 supplied is only suitable for use with the freewheel bell 36/40 or the hub bell 36/45.