Mercury – Complete Gearcase | Bravo Three / Three X Series | Corrosion-Resistant Alloy | 8M0046733Mercury Complete Gearcase Bravo Three Three X Series Corrosion Resistant Alloy 8M0046733 Overview If you run a Bravo Three drive, you already know how much trust you place in the gearcase. Its doing the hard work every time you ease into gear, trim up onto plane, or push through a tight turn with a crosswind. When a gearcase starts to fail, you feel it in your gut long before you hear it. That is why boaters who demand reliability turn to the Mercury