Yamaha - Gear Lower Unit Drivetrain Component 6L2-45560-10-00. Overview. When gears inside the lower unit start wearing down, you'll notice it right away-noise, rough engagement, or slipping under load. This is one of those parts that takes constant stress every time you run the motor. I've worked on plenty of units where a worn gear was the root of the problem. Replacing it brings things back to smooth, solid operation and helps avoid bigger damage down the line.. Key Features. Precision-Cut Gear Teeth - Ensures smooth engagement and efficient power transfer.. High-Strength Construction - Built to handle torque and load without premature wear.. Factory-Spec Fitment - Designed to match Yamaha lower unit tolerances for proper alignment.. Restores Drivetrain Performance - Helps eliminate slipping, noise, and rough operation.. Wear-Resistant Surface - Engineered to withstand continuous contact and high-speed rotation.. Engine & Boat Compatibility. Designed for Yamaha outboard engines with