Volvo Penta 3868913 Assemblies Volvo Penta DP-SM 1.95:1 Complete Drive Assembly Original Volvo Penta Normalized SKU: 3868913

Mercury Marine Assemblies The Mercury Marine Alpha One Gen II sterndrive with a 2.00:1 gear ratio is built for applications where low-end torque and pulling power matter more than top-end speed. That higher gear ratio multiplies propeller thrust, making it a natural fit for heavier hulls, pontoon boats, and larger family cruisers that spend more time cruising comfortably than chasing the horizon at wide-open throttle. This is a complete sterndrive assembly in standard right-hand rotation, ready to bolt up to a compatible Alpha One Gen II transom assembly. The Gen II platform has been in production since 1991 and brought a number of improvements over the original Alpha One design, including a revised water pump housing, updated sealing throughout, and a more robust shift shaft that addressed durability concerns from earlier units. If you have been running an older drive and it is time for a full replacement rather than another round of repairs, this is the clean-slate solution. The 2.00:1 ratio pairs well with higher-horsepower engines where you want the prop to work harder at lower RPM rather than spinning freely at the top end. Prop selection matters here, so if you are doing a repower or swapping ratios, it is worth revisiting your propeller pitch to get the most out of this drive. A core charge and/or container charge may apply to this item at the time of purchase. Key specs and features at a glance: Complete Alpha One Gen II sterndrive assembly 2.00:1 gear ratio Standard right-hand rotation Compatible with Mercury and Mercruiser Alpha One Gen II bellhousing (1991 and newer) Revised water pump housing and improved sealing over Gen I design Updated shift shaft for improved durability Well-suited for heavier hulls and higher-torque applications OEM Mercury Marine part Normalized SKU: 551100007PUPC Code: 678633122156

Sierra 18-2452 AssembliesUpper Unit AssemblyOEM Interchange:MERCURY MARINE: 1547-9412A22Sierra Upper Unit Assembly #18-2452Normalized SKU: 182452UPC Code: 808282113124

Sierra 18-2451 AssembliesUpper Unit AssemblyOEM Interchange:MERCURY MARINE: 1547-9412A21Sierra Upper Unit Assembly #18-2451Normalized SKU: 182451UPC Code: 808282113117