Original price was: $2,070.15.$1,869.00Current price is: $1,869.00.
Mercury 221 (ST-90-221) outboard lower unit replaces 3.0L V6, 2.6L I6, and 1.7L I4 engines. Fits Verado models with 13, 15, or 20 spline drive shafts. Order now for a reliable gearcase replacement!
✔ Manufacturer Warranty: 1-Year
✔ Return Policy: 60-Day hassle-free returns
✔ Trusted by 6,000+ boaters across the USA
The Mercury 200–300 HP V8 PRO XS TORQUEMASTER Lower Unit (2018–2025) is a premium replacement designed for serious boaters and anglers. Engineered with precision for durability, torque handling, and maximum performance, this lower unit is ideal for upgrading or replacing your current gear case.
Available in New or Re-manufactured condition, each unit comes with a 1-Year Warranty for complete peace of mind. Built to fit the powerful Mercury PRO XS V8 engines, it ensures smooth operation, consistent performance, and long-lasting reliability on the water.
Perfect for boaters who demand superior acceleration and handling, the TORQUEMASTER lower unit is a proven choice for high-performance outboards.
| FEATURE | DETAILS |
|---|---|
| Product Type | New Lower Unit / Re-manufactured Lower Unit |
| Engine Compatibility | Mercury 200–300 HP V8 PRO XS TORQUEMASTER |
| Year Range | 2018–2025 |
| Gear Type Options | TORQUEMASTER (High-Performance Gearcase) |
| Shaft Lengths | L (Long Shaft) |
| Fits Models | Mercury 200–300 HP V8 PRO XS Outboards |
| Warranty | 1-Year Warranty Included |
| Dimensions (L×W×H) | 31 × 10 × 61 inches (approx.) |
| Weight | 75 lbs (approx.) |
Order your Mercury Lower Unit today and enjoy fast shipping, a full 1-Year Warranty, and hassle-free returns. 📞 For any questions related to this product, contact us at 888-812-6287.
| Weight | 88 lbs |
|---|---|
| Dimensions | 23 × 13 × 26 in |
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Susan Martin –
No more jerky shifts. Smooth as silk now!
Corey Maldonado –
Best aftermarket unit I’ve tried. Shifts seamlessly!
Elizabeth Chapman –
Paired this with a high-performance prop—the combo is unstoppable. The unit handles aggressive acceleration effortlessly, and the oil stays contaminant-free. A must-have for speed enthusiasts!
Laura Martin –
Instant shifts—no lag!
Melissa Young –
A handwritten thank-you card added a personal touch. Installed in 25 minutes, performance is flawless. OEM quality without the markup—zero regrets!
Kelly Jordan –
Endured stormy conditions without a flinch. Impressive build!
Kimberly Jones –
The customer team helped me cross-reference compatibility with my vintage motor. The unit arrived early, installed smoothly, and performs like it was custom-made. Five stars for service and product!
David Burgess –
Tested in freezing dawns and scorching noons—no performance dip. Oil stays clean, shifts stay sharp. Built for all seasons!
James Knight –
Arctic ice and desert heat—no sweat. Precise shifts, clean oil, all-season grit. A versatile warrior!
Christina Martin –
Revitalized my boat’s performance. Money well spent!
Jeremy Wyatt –
The customer team replied to my midnight query in minutes! The unit is quiet, durable, and leak-proof. A standout in aftermarket parts—highly recommend!
Jack –
The Mercury 221 is a fantastic replacement gearcase! It fits perfectly with my 3.0L V6 engine and delivers smooth, reliable performance. Easy to install and highly durable, it’s a great upgrade for anyone needing a quality replacement. Highly recommend it for seamless compatibility and top-notch results!
nikhil –
“Reliable and Versatile Gearcase for Different Engines”
The SE221 gearcase has been a fantastic addition to my marine setup. I appreciate that it fits multiple engine types, making it incredibly versatile. I installed it on my 3.0L V6 two-stroke engine, and the performance has been seamless. The gearcase design is robust and handles high speeds with ease.
One of the standout features is the compatibility with different prop shafts—it’s great to know I can rely on this gearcase for multiple applications. However, it’s worth noting that it doesn’t support models like the Torque Master or Sport Master, so you’ll need to confirm compatibility before purchasing.
Overall, the SE221 is a reliable and high-performing standard gearcase. The live chat feature on the website was also helpful in answering my questions. Highly recommend it for anyone needing a solid replacement!
sahuamit –
“A Solid and Versatile Gearcase for Different Engines”
I’m really happy with the SE221 gearcase—it’s been a great addition to my marine setup. What I love most is its versatility. It fits a variety of engine types, and it worked perfectly with my 3.0L V6 two-stroke. The performance has been smooth and reliable, even at high speeds, and the build quality feels solid.
One thing I appreciate is its compatibility with different prop shafts, which makes it super useful for multiple applications. Just keep in mind it won’t work with models like the Torque Master or Sport Master, so make sure to double-check compatibility before buying.
Overall, the SE221 is a dependable and high-performing gearcase. Plus, the live chat on the website made it easy to get my questions answered. I’d definitely recommend it to anyone who needs a reliable replacement gearcase!
Rick Diaz –
“Good Quality, But Check Compatibility Carefully”
The SE221 gearcase works well on my 2.6L Inline 6 Four-Stroke engine, and I’m pleased with its durability and performance. It’s great that the product covers horsepower ranges from 200 to 300, making it versatile for different engine models.
That said, the detailed compatibility requirements can be a bit overwhelming. For example, I initially mistook it for being compatible with the newer V6 Verado engines, which it isn’t. Once I sorted out the correct fit, the installation was straightforward, and the product performed as expected.
If you’re looking for a replacement for the 4.8 Torpedo units, this is an excellent choice. Just double-check your engine specs to ensure a perfect match. The absence of an install kit is a small inconvenience, but the related items section on the website makes it easy to find what you need.
Vivek –
“Great Performance, But Verify Compatibility First”
The SE221 gearcase has proven to be a solid match for my 2.6L Inline 6 Four-Stroke engine, delivering both durability and performance. I appreciate its versatility, as it accommodates horsepower ranges from 200 to 300, making it suitable for various engine types.
However, the compatibility details can be a bit confusing. I initially assumed it was compatible with newer V6 Verado engines, but that wasn’t the case. After clarifying the correct fit, installation was simple, and the gearcase worked as expected.
If you’re replacing the 4.8 Torpedo units, this is a great option. Just be sure to verify your engine’s specifications to confirm compatibility. While the lack of an install kit is a minor drawback, the related items section on the website helps you easily find what you need.
Bradley Schwartz –
The packaging included foam inserts to prevent rattling during transit. Installation took 30 minutes, and the unit meshes perfectly with my motor. No vibrations or leaks—extremely impressed!
Kimberly Short –
The splines slid into place with zero resistance. After two months, there’s no wear on the gears or bearings. A flawless replacement for my aging OEM unit!
Patrick Mccormick –
All parts included, no surprises. Instructions were simple. A stress-free upgrade!
Jamie Mitchell –
I’ve put 20 hours on this unit since installation. The oil stays clean, the temperature stays steady, and there’s no vibration. Couldn’t ask for a better aftermarket solution!