Mercury Alpha One Gen II Complete Sterndrive – 2.00 Ratio, Standard Rotation
Mercury part number 5-5121600TP is a complete new Genuine Mercury OEM Alpha One Generation II sterndrive with a 2.00 gear ratio and standard right-hand rotation.
Important for Pre-1983 Applications: When installing this Alpha One sterndrive as a replacement on earlier pre-1983 inline 4-cylinder or 6-cylinder models, the standard yoke must be replaced with the original short U-joint yoke. The short yoke is not included with this drive and must be removed from the old sterndrive for reuse.
Drive Specifications
- Mercury part number: 5-5121600TP
- Drive model: Alpha One Gen II
- Gear ratio: 2.00
- Rotation: Standard right-hand (RH)
- Condition: New Genuine Mercury OEM
- Warranty: 1-year Mercury factory warranty
This Complete Assembled Sterndrive Includes:
- Upper gear housing assembly
- Lower gear housing assembly
- Yoke and universal joint assembly
- Integrated seawater pump
- Mounting gasket and hardware
- Installation hardware
- Drive mounting gasket
- Speedometer connector, part number 860382A1
- 16 oz bottle of Mercury High Performance Gear Lube
Not Included:
- Propeller
- Transom or gimbal housing assembly
- Trim cylinders
Alpha One Gen II Applications
Alpha One Gen II sterndrives are designed for boats capable of speeds up to 65 MPH and are commonly used with gasoline engines producing up to 300 HP and diesel engines producing up to 150 HP.
The efficient hydrodynamic profile helps reduce drag, while the integrated seawater pump and permanently lubricated pivot points help simplify routine maintenance.
🔧 BAM Tip: Before ordering, confirm that the gear ratio and rotation listed on this page match the drive being replaced. If you are unsure, contact us with both the engine serial number and sterndrive serial number so we can help verify the correct replacement.
