Mercury - Drive Gear Bearing Assembly Bravo Series Sterndrives Precision Roller Bearing 8M0104358. Overview. Anyone who spends real time on the water knows this truth: smooth, predictable power is everything. When you throttle up, you want your sterndrive to respond cleanly-with no chatter, no hesitation and no unsettling vibrations. That feeling of confidence comes from more than horsepower alone. It comes from the unseen components inside your drive that carry the load day after day. The Quick