Yamaha - Propeller Shaft Lower Unit Drivetrain 6L2-45611-00-00. Overview. When something feels off in the drivetrain-vibration, noise, or uneven power-it can often trace back to the prop shaft. It's a critical piece that takes all the engine's output and delivers it straight to the prop. I've seen bent or worn shafts cause all kinds of issues that don't go away until it's replaced. Once you put in a fresh one, everything runs smoother and more balanced right away.. Key Features. Direct Power Transfer - Delivers engine output efficiently to the propeller for smooth performance.. High-Strength Construction - Built to handle torque and load without bending or premature wear.. Precision-Machined Fit - Ensures proper alignment within the lower unit for reliable operation.. Durable Surface Finish - Designed to resist wear from constant rotation and contact.. Restores Drivetrain Stability - Helps eliminate vibration and uneven power delivery.. Engine & Boat Compatibility. Designed for Yamaha