This SEI Marine 6-Jaw Propshaft is a direct aftermarket replacement for MerCruiser Alpha One and Alpha One Gen II Sterndrives from 1972 to present.
Engineered for standard rotation applications, it replaces OEM 44-850308 and 44-824110 and ensures precise alignment, smooth operation, and long-term reliability.
This versatile propshaft also fits Mercury Outboard 70–125 HP Inline 3 & 4-cylinder engines (reverse gear only, 1997 and up) and 3.0L engines (1994–2005).
Built to OEM standards and backed by SEI’s 3-Year Fault-Free Warranty, this shaft provides high-quality performance across both sterndrive and outboard applications.
Product Features
- Direct OEM Replacement: Replaces MerCruiser OE# 44-850308 and 44-824110
- Fitment (Sterndrive): MerCruiser I, R, MR, Alpha One, and Alpha One Gen II drives (1972–Present)
- Fitment (Outboard): Mercury 70–125 HP Inline 3 & 4-cylinder (reverse gear only, 1997 and up), and 3.0L engines (1994–2005)
- Design: 6-Jaw Propshaft for standard rotation
- Rotation: Standard (Right-Hand)
- Condition: 100% brand-new SEI Marine replacement propshaft
- Warranty: 3-Year Fault-Free Warranty provided by SEI Marine
Additional Information
Note: For reverse gear Mercury applications, this propshaft is compatible with 6-jaw designs only.
All parts required for complete sterndrive or lower unit rebuilds are available upon request.
If you need additional components, please email or fill out the contact form and we will assist you in locating everything needed.
Shipping Information
SHIPPING: Additional shipping fees to Alaska, Hawaii, U.S. Territories, or international destinations will be calculated after checkout.
You will receive an email and a PayPal money request for the additional shipping charges at the email address provided.
(Some items are excluded from international shipping.)
Customer Support
For questions or to confirm compatibility, please email customerservice@marinepartswarehouse.com .
Please include your engine model number to help confirm proper fitment before ordering.
