Yamaha - Propeller Shaft Lower Unit Drivetrain 6AW-45611-00-00. Overview. This is the part that takes everything your engine's putting out and sends it straight to the prop. When it's true and balanced, you get smooth acceleration and solid bite in the water without thinking about it. But once a shaft gets even slightly off, you'll feel it right away-usually as vibration or seal issues. It's built to handle real-world use, from long runs offshore to the occasional hard hit you didn't see coming.. Key Features. Direct Torque Transfer - Moves engine power efficiently to the propeller for consistent thrust.. Precision Machined Alignment - Designed to run true within the lower unit for smooth operation.. High-Strength Build - Handles heavy loads and impact stress common in marine environments.. Seal-Friendly Surface Finish - Helps protect seals and reduce the chance of gear oil leaks.. Engine & Boat Compatibility. Designed for Yamaha outboard lower units using this propeller shaft configur