Boat Lower Unit & Gearcase Selection & Education
Finding the right replacement lower unit for a Mercury outboard takes more than matching horsepower. Gearcase fitment can vary based on the engine family, serial number, shaft length, gear ratio, rotation, and other application-specific details.
The Gregor's Marine Lower Unit & Gearcase Center is designed to help you understand your options, identify the information you'll need, and shop genuine Mercury and Quicksilver gearcase assemblies and components.