This SEI Marine Heavy Duty Upper Gear Set is designed and manufactured by SEI specifically for Mercruiser 5.0L V8 sterndrives with 1.62:1 or 1.65:1 gear ratios.
It fits Type I, R, MR, and Alpha I drives produced from 1972 through 1990 (serial numbers 0K999999 and below).
This upgraded SEI-designed gearset features enhanced metallurgy and precision machining for superior strength, smooth shifting, and extended life under high load conditions.
Ideal for performance and heavy-duty marine applications requiring dependable power transfer.
Product Features
- Manufacturer: SEI Marine
- Application: Mercruiser I, R, MR, Alpha I (1972–1990)
- Engine Compatibility: 5.0L V8
- Gear Ratio: 1.62:1 / 1.65:1
- Design: SEI Engineered Heavy-Duty Construction
- Fitment: All Alpha, I, R, MR drives with serial numbers up to 0K999999
- Performance: Reinforced gear teeth for increased torque load and longevity
- Condition: 100% brand-new SEI Marine replacement gear set
- Warranty: 3-Year Fault-Free Warranty by SEI Marine
Additional Information
Note: Designed for Mercruiser Alpha 1 and compatible I, R, MR drives (OK999999 and below).
Engineered for 1.62:1 and 1.65:1 ratio applications.
Provides upgraded durability for high-demand or performance boating setups.
All related lower and upper rebuild components are available upon request.
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 and serial number to ensure correct ratio selection and fitment.
