Description
Aftermarket Counter Rotation Lower Unit for Mercury 3.0L – 200, 225 & 250 HP, 13 Splines, 25″/30″ Shaft (1986–2011)
This new aftermarket mercury lower unit 3.0 Counter Rotation outboards with counter rotation, specifically models rated at 200 HP, 225 HP, and 250 HP. Engineered for a great fit, this unit features 13 splines and supports both 25″ and 30″ shaft lengths, making it ideal for a wide range of offshore and high-performance Mercury setups.
Designed to match OEM spec #859399T13, this unit is a choice when replacing your Mercury counter rotation lower unit. Compatible with Mercury lower units built between 1986 and 2011, it provides reliability for recreational boaters.
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.
Get the right lower unit for your outboard when you call us today. Take the guess work out of ordering online.
Pricing
Total Price: $1,395
Less $200 Core Rebate 
Final Price: $1,195
Core Rebate Information
- Return your old core, get up to $200 back
- Rebate amount will vary based on the condition of your core
- ♻️ Recycle your core- keep boat parts out of the landfill
Useful Resources
- 🔍 How to find your Boat Engine serial number?
- Still deciding? Watch our YouTube video How to avoid common lower unit replacement mistakes
- To help extend the life of your gearcase, check out our Boat Maintenance Checklist
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