This SEI Marine Short Input Yoke Shaft is a direct replacement for MerCruiser Alpha One sterndrives (1972–1990) and is designed to fit old-style inline 4-cylinder and inline 6-cylinder engines.
Measuring 8-1/8", this precision-machined input yoke ensures smooth driveline coupling and proper torque transfer between the engine and sterndrive.
Replaces OEM 39385A1, providing OEM-quality performance, long-term reliability, and corrosion resistance.
Protected by SEI’s 3-Year Fault-Free Warranty, this yoke is built to deliver lasting strength in marine applications.
Product Features
- Direct OEM Replacement: Replaces MerCruiser OE# 39385A1
- Fitment: MerCruiser Alpha One Sterndrives (1972–1990)
- Engine Compatibility: Old-style inline 4-cylinder and inline 6-cylinder engines
- Length: 8-1/8"
- Design: Short input yoke shaft
- Condition: 100% brand-new SEI Marine replacement component
- Warranty: 3-Year Fault-Free Warranty provided by SEI Marine
Additional Information
Note: Designed for early-style inline 4 and inline 6 engines.
All parts required for a complete sterndrive rebuild are available upon request, even if not listed online.
If you need additional driveline or coupling 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.
1 Review
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Drive shaft
Could be set up better for international sales, like Amazon.
