Yamaha Lower Unit Assy - 6GD-G5300-00-8D. The Yamaha Lower Unit Assy - 6GD-G5300-00-8D is designed to enhance the performance and reliability of your Yamaha outboard motor. This lower unit assembly ensures a precise fit and optimal functionality, significantly improving your marine engine's overall efficiency. Constructed from high-quality materials, it is built to withstand the toughest marine conditions, offering exceptional durability and consistent performance.. With the Yamaha Lower Unit Assy - 6GD-G5300-00-8D, you can expect smooth and efficient power transmission that minimizes drag and maximizes thrust. This leads to better fuel economy and a smoother ride on the water. Trust in Yamaha's commitment to quality and innovation with this lower unit assembly, ensuring your boat operates at its peak in all conditions, providing you with a reliable and enjoyable boating experience.. 6GD-G5300-00-8D - LOWER UNIT ASSY