Aftermarket Lower Units
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Aftermarket Lower Units
Need a lower unit replacement without the remanufactured price tag? Aftermarket lower units are built new by third-party manufacturers to OEM specifications — a viable option for budget-conscious boaters, older boats, or situations where insurance doesn’t cover the full cost.
US Boatworks carries aftermarket lower units for Mercury, Mercruiser, Evinrude-Johnson, and OMC. Every unit ships within 24 hours and comes with a 3-year fault-free warranty handled directly by the manufacturer.
- Built new to OEM specifications
- 3-year fault-free warranty — handled by the factory
- Compatible and interchangeable with OEM drives
- Optional core return rebate if you have a good core
- Usually ships in 24 hours
Not sure if aftermarket is right for your situation? Call us before you order — we’ll give you a straight answer based on your engine, your budget, and how long you plan to keep the boat. 913-342-0011
Aftermarket Lower Units
| MERCURY LOWERS FITS: | PRICE | DETAILS |
|---|---|---|
| Mercury 3 & 4 Cylinder OB Bigfoot | $ 1,195 - $200 rebate for return of good core = $ 995 | More Info |
| Mercury 2.0, 2.4 &2.5 Liter | $ 1,195 - $200 rebate for return of good core = $ 995 | More Info |
| Mercury 3.0 Liter | $ 1,195 - $200 rebate for return of good core = $ 995 | More Info |
| Mercury 3.0 Liter, Counter Rotation | $ 1,395 - $200 rebate for return of good core = $ 1,195 | More Info |
| FITS MERCRUISER | PRICE | DETAILS |
|---|---|---|
| Alpha One Lower | $ 1,065 – $200 refund for return of good core = $ 865 | More Info |
| Alpha One, Counter Rotation Lower | $ 1,295 – $200 refund for return of good core = $ 1,095 | More Info |
| Bravo I Lower, Single Water Pickup | $ 1,295 – $200 refund for return of good core = $ 1,095 | More Info |
| Bravo I Lower, Dual Water Pickup | $ 1,295 – $200 refund for return of good core = $ 1,095 | More Info |
| Gen II Lower | $ 1,065 – $200 refund for return of good core = $865 | More Info |
| Gen II HA Lower | $ 1,065 – $200 refund for return of good core = $ 865 | More Info |
| Gen II, Counter Rotation Lower | $ 1,325 – $200 refund for return of good core = $ 1,125 | More Info |
| Alpha One Upper 1.94, 1.81, 1.62, 1.47 | $ 965 | More Info |
| Gen II Upper 1.94, 1.81, 1.62, 1.47 | $ 965 | More Info |
| Alpha One Complete Upper and Lower | $ 1,935 – $200 refund for return of good lower core = $1,735 | More Info |
| Gen II Complete Upper & Lower | $ 2,165 – $200 refund for return of good lower core = $1,965 | More Info |
| FITS EVINRUDE | PRICE | DETAILS |
|---|---|---|
| Early Model V4 | $ 1,195 - $200 rebate for return of good core = $995 final cost | More Info |
| Late Model V4 | $ 1,195 - $200 rebate for return of good core = $ 995 final cost | More Info |
| V4 Large | $ 1,195 - $200 rebate for return of good core = $995 final cost | More Info |
| V6 | $ 1,395 - $200 rebate for return of good core = $1,195 final cost | More Info |
| V6 Counter Rotation | $1,345- $200 rebate for return of good core = $ 1,145 final cost | More Info |
| Magnum | $1,395 -$200 rebate for return of good core = $ 1,195 final cost | More Info |
| Magnum Counter Rotation | $1,645 – $200 rebate for return of good core= $1,445 final cost | More Info |
Aftermarket Lower Units
What You Should Know Before You Buy
Aftermarket lower units are the most affordable replacement option — and for the right situation, they make sense. Preparing a boat for resale, replacing a unit on an older engine, or working within a tight budget are all legitimate reasons to consider aftermarket.
What matters is choosing the right manufacturer. Not all aftermarket units are built to the same standard. US Boatworks carries units from manufacturers we trust — built new to OEM specs with quality internal components.
Our honest advice: if you plan to keep the boat long term and run it hard, call us and let’s talk through your options. A remanufactured unit with OEM internals may cost a few hundred dollars more upfront but could save you significantly more down the road. We’d rather tell you that now than have you call us after a unit fails mid-season.
Read our Lower Unit Replacement Guide — remanufactured vs aftermarket vs OEM explained →
Useful Resources
- 🔍 How to find your Boat Engine serial number
- Still deciding? Read our Lower Unit Replacement Guide — remanufactured vs aftermarket vs OEM explained.
- To help extend the life of your gearcase, check out our Boat Maintenance Checklist
Most Asked Questions
What are aftermarket lower units?
Aftermarket lower units are built new by third-party manufacturers to OEM specifications — not remanufactured, not used. They’re a cost-effective alternative to new OEM units, designed to be fully compatible and interchangeable with your engine. US Boatworks carries aftermarket units from manufacturers we trust for Mercury, Mercruiser, Evinrude-Johnson, and OMC.
What brands do you offer aftermarket lower units for?
We carry aftermarket lower units for Mercury, Mercruiser, Evinrude-Johnson, and OMC. Have your engine model number or serial number ready and we’ll confirm the right fit before you order.
What are the primary advantages of choosing aftermarket lower units?
Price is the main advantage — aftermarket units are significantly less expensive than new OEM and somewhat less than remanufactured. They ship within 24 hours, come with a 3-year fault-free warranty handled directly by the factory, and are fully compatible with OEM drives. For budget-conscious boaters or those preparing a boat for resale, aftermarket is a legitimate option.
How do aftermarket lower units compare to OEM units in terms of performance and durability?
Is the availability of aftermarket lower units a concern compared to OEM replacements?
No — aftermarket units are typically in stock and ship within 24 hours. New OEM units often require ordering direct from the factory, which can mean multi-week wait times during peak season. If you need to get back on the water fast, aftermarket ships faster than new OEM in most cases.
What additional benefits do US Boatworks' aftermarket lower units provide?
<p>Every aftermarket unit we sell includes all internal parts, is fully compatible with OEM drives, and comes with a 3-year fault-free warranty handled directly by the factory. Optional core return rebate available if you have a good OEM core to send back.</p>
What factors should be considered before choosing aftermarket lower units?
Three things: how long you plan to keep the boat, how hard you run it, and whether your insurance covers the replacement. If you’re keeping the boat long term or run it hard, a remanufactured unit with OEM internals may be the better investment. If budget is the priority or you’re preparing the boat for resale, aftermarket makes sense. Call us — we’ll help you think it through. 913-342-0011
Does US Boatworks have dedicated, trained personnel that can answer my questions?
Yes — our factory-trained team has been doing this for over 40 years. Call, text, or email us and we’ll answer every question straight. No runaround.
How can I get help choosing the right unit?
Contact us by phone, text, or email. Have your engine model or serial number ready — it’s the fastest way to confirm the right fit. Not sure where to find it? Here’s how →
