Yamaha Lower Unit Assembly - F225- 69J-45300-30-8D - See Description For Applicable ModelsYamaha Lower Unit Assembly Complete Drivetrain System 69J 45300 30 8D Overview When a lower unit is running right, you get smooth shifting, solid bite in the water, and no surprises underway. This is the part that takes everything the engine produces and puts it to work at the prop. Once wear or damage sets in, it doesnt stay quiet for longyoull hear it or feel it through the hull. Dropping in a complete assembly like this is usually the fastest way