This SEI Marine 20" (L) driveshaft is a direct replacement for Mercury & Mariner 4-Stroke EFI 70–115 HP outboards with serial numbers 1B366822 and below.
Featuring an 18-spline upper, this shaft restores proper drivetrain alignment and engagement on early-style EFI models requiring OEM #45-858765T1.
Engineered to match OEM specifications, this driveshaft ensures smooth, reliable performance.
Product Features
- Fits Mercury / Mariner 4-Stroke EFI 70–115 HP
- 20" L-length driveshaft
- For engines with serial numbers 1B366822 and below
- 18-spline upper design
- Direct OEM replacement for 45-858765T1
- Precision-manufactured for durability and correct fitment
- Brand: SEI Marine
Additional Information
All rebuild components—including seals, bearings, gears, and hardware—are available upon request.
If additional parts are needed for a complete lower-unit rebuild, please contact us.
Shipping Information
Additional shipping fees to Alaska, Hawaii, U.S. Territories, or international locations will be calculated after checkout.
You will receive an email and PayPal money request for any additional freight 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.
