This SEI Marine driveshaft is a direct replacement for the Mercury & Mariner 2-Stroke DFI (Optimax) 75–115 HP outboards.
Designed specifically for 25" (XL) 3- and 4-cylinder models, this shaft restores proper drivetrain alignment and performance.
Manufactured to OEM specifications for a precision fit and long service life.
Product Features
- Fits Mercury / Mariner 3- & 4-cylinder DFI (Optimax)
- Compatible with 75–115 HP two-stroke models
- 25" (XL) driveshaft
- Direct OEM replacement for 45-888934A1
- High-strength corrosion-resistant construction
- Brand: SEI Marine
Additional Information
All rebuild components—gears, seals, bearings, and hardware—are available upon request.
Contact us if you need additional parts for a full lower-unit rebuild.
Shipping Information
Additional shipping fees to Alaska, Hawaii, U.S. Territories, or international destinations will be calculated after checkout.
A follow-up email and PayPal request will be sent for any added shipping charges.
(Some items may be excluded from international shipping.)
Customer Support
For questions or compatibility confirmation, email: customerservice@marinepartswarehouse.com
Please include your engine model number.
