Three wheeler gear box assembly parts, a set of gearbox gears, shafts and selector components for three wheeler transmissions. It includes ring gears and spur gears with straight-cut teeth, a tall stacked cluster gear on its shaft, black cross-shaped spiders, plain and stepped shafts, a cylindrical housing piece and a gear selector unit with a lever. The metal parts carry a machined steel finish, with some pieces in black. The gearbox sets the gear ratio between engine and wheels, so a three wheeler can pull away loaded and still cruise at speed.