Upgrade your boating experience with the MerCruiser Alpha One Gen 2 Outdrive (1.81 Ratio), part number 5121400TP—a high-quality, factory-assembled lower unit built by Mercury Marine, the trusted name in marine propulsion. This Alpha I Gen II sterndrive is a genuine OEM MerCruiser outdrive, offering superior performance, durability, and compatibility for a wide range of applications.

This Alpha One Gen 2 outdrive is designed to replace existing Alpha 1 Gen II units from 1991 and newer, making it a perfect fit for both recreational and commercial marine use. It is an ideal match for various MerCruiser Alpha 1 Gen 2 engine setups, including 4.3L V6 and 5.0L/5.7L V8 configurations. The 1.81 gear ratio offers a well-balanced combination of speed, torque, and fuel efficiency, making it perfect for multi-purpose boating—from cruising to watersports.

Unlike aftermarket models, this Alpha 1 outdrive is built to precise Mercury Marine specifications. It comes factory-lubricated, pressure-tested, and sealed—ready for a direct bolt-on installation. Quicksilver, Mercury Marine’s OEM division, ensures this drive meets the highest standards in strength, finish, and hydrodynamic performance.

If you’re looking to replace your worn or damaged Alpha outdrive, this is your factory-perfect solution. The Counter Rotation version (5111400TP) is also available—just give us a call!