Mercury - Bevel Gear Assy - 43-8M0156174. The Mercury - Bevel Gear Assy - 43-8M0156174 delivers dependable power transfer for your lower unit, ensuring smooth and efficient engine-to-propeller performance. As a genuine Mercury OEM component, this assembly is precision-engineered to maintain proper alignment and durability under high-load marine conditions.. Key Features. OEM-Certified Fit - Manufactured to Mercury's strict specifications for seamless integration and performance. Bevel Gear Assem