Description
Mercury Lower Unit # 821306T28 | 40–50 HP 2-Stroke Outboards
This remanufactured lower unit is built to restore the original performance of your 40 HP or 50 HP Mercury 2-stroke outboard motor. Designed specifically for outboards using a 1.83 gear ratio, it replaces OEM part #1682-821306T28 and is ideal for models manufactured from the early 1980s through the mid-2000s—including popular years like 2000, 2001, 2002, and 2008.
Rebuilt by certified marine technicians in the USA, this unit is assembled using Mercury Marine OEM Parts and precision machining for long-lasting reliability.
Whether you’re restoring a classic 50 HP Mercury outboard or repairing a 40 HP 2-stroke engine, this gearcase is a dependable alternative to brand-new lower units—backed by a 1-year warranty.
View our parts finder to find Mercury Outboard parts diagrams to verify this is a match or contact us using the buttons at the bottom of the page.
You can also use our parts finder to find other Mercury Boat Parts for your Mercury Outboard.
Don’t get stranded with sub-par units from other rebuilders. Get your quality US Boatworks reman lower unit today!
Benefits of Our Remanufactured Lower Units
✅ 1-Year Warranty
✅ Remanufactured by Certified Mechanics in the USA
✅ OEM Parts
✅ Significant $ Savings
Pricing
Total Price: $2,095
Less Potential $300 Refundable Core Deposit
👉 Final Price: $1,795
Product Finish
- Gearcases come in gray primer
- Includes a can of factory spray paint for final finishing if desired
Core Deposit Information
- Return your old core, get up to $300 back.
- Refund amount will vary based on the condition of your core
- Please review our Core Policy for details on how to return your old core and claim your deposit
- ♻️ Recycle your core: Keep boat parts out of the landfill & receive $ back
Useful Resources
- How to find your Boat Engine serial number
- Still deciding? Watch our YouTube video on “How to avoid common lower unit replacement mistakes“
- To help extend the life of your gearcase, check out our Boat Maintenance Checklist
🛥️ Please have your Engine Serial # ready when you contact us if possible. 🛥️
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