Brand New Mercury Mercruiser Alpha One Gen I Lower Driveshaft Assembly (1969-1990) (Copy)

This is a brand new genuine Mercury lower driveshaft assembly (also known as the lower gearcase or lower unit) for Mercruiser Alpha One Generation I sterndrives, compatible with models from 1969 to 1990. It includes a 1-year manufacturer warranty for peace of mind and comes complete with a water pump installed.

Please note: This item is typically not stocked in-store and ships directly from the manufacturer for guaranteed freshness and quality.

Important Fitment Information: To ensure full compatibility, please provide your sterndrive serial number and engine details (HP, cylinders, model) from the transom bracket. We're here to help verify the match!

Special Note for Older Units: For Alpha One serial numbers 0D494569 and below (typically pre-1991), as well as older "R" style units with 4-cylinder or 6-cylinder engines, the upper driveshaft yoke (input shaft) length may differ. These often require reuse of your existing input shaft/yoke for proper fitment. Please confirm your yoke measurement or provide details so we can advise accordingly.

If you have any questions, feel free to email us at jhawknz@gmail.com or call 615-691-1433. Our team is ready to assist with your purchase.

This lower driveshaft assembly comes complete and ready for installation, with no core charge required.

An optional 12-month extended warranty is available for an additional $540.

Welcome to OBR Parts and Marine Since 1982, OBR has been the industry leader in providing new and remanufactured outboard powerheads, gearcases, and sterndrive units. Marine parts dealers across the nation trust us for top-quality components, prompt same-day shipping, and expert technical support. We're committed to getting you back on the water quickly and reliably!