Yamaha - Gear set - 6AX-45550-00-00Yamaha Gear Set Lower Unit Drive System 6AX 45550 00 00 Overview Inside the lower unit, this gear set is what actually puts power to the water. When everythings right, you dont think about ityou just feel smooth engagement and solid push every time you throttle up. But when gears start wearing or chipping, youll hear it and feel it quick. This Yamaha gear set is built to handle that load day in and day out, whether youre running hard offshore or