Yamaha - Gear 2 Assembly Lower Unit Drivetrain 6E0-45570-00-00. Overview. When you start hearing noise or feeling vibration from the lower unit, gears are usually at the center of it. This assembly handles a lot of load every time you're on the throttle, and once wear sets in, it only gets worse. I've torn down units where one worn gear ended up affecting everything around it. Replacing it with a proper assembly brings things back to smooth, dependable operation.. Key Features. Integrated Gear Assembly - Designed as a complete unit for proper meshing and alignment.. High Load Durability - Built to handle constant torque and drivetrain stress.. Smooth Rotation Performance - Helps reduce vibration and maintain consistent power transfer.. OEM Precision Fitment - Matches original specifications for reliable installation and function.. Engine & Boat Compatibility. Designed for Yamaha 2-stroke outboard engines with standard lower unit gearcases. Commonly used on smaller to mid-range horsepow