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Required for fitment review to confirm compatibility.
The OBR Mercury Verado HD prop shaft lower unit is a 5.44-inch replacement gearcase for selected Verado L6 applications. This page includes two separate application families: 1.85:1 units for selected 200, 225, 275 and 300 HP engines, and 1.75:1 units for selected 300, 350 and 400 HP engines.
New and remanufactured options are available with 20-inch L, 25-inch XL and 30-inch XXL shafts. All variants currently offered on this page are standard-rotation configurations.
Horsepower alone cannot confirm fitment. A 300 HP Verado may appear in either ratio family, depending on its original configuration. Match the engine’s original ratio, 5.44-inch housing, HD prop-shaft configuration, shaft length and rotation. Enter the complete engine serial and model numbers before ordering. Fitment for 250 HP applications must be confirmed before purchase.
Heavy-Duty Architecture: Features the oversized 5.44″ housing for superior gear strength and durability.
Supercharged Ready: Optimized for the high-torque power curves of the L6 Verado platform.
Saltwater Protection: Advanced marine-grade coating ensures maximum corrosion resistance in demanding ocean conditions.
Cataloged for selected 2006–2021 Mercury Verado L6 applications:
Available in 20-, 25- and 30-inch standard-rotation configurations.
Cataloged for selected 2006–2021 Mercury Verado L6 applications:
Available in 20-, 25- and 30-inch standard-rotation configurations.
The exact supplier listings reviewed do not include 250 HP. Confirm any 250 HP engine with OBR before ordering. Exact engine model suffixes were not supplied and must be verified using the complete serial and model numbers.
Before shipment, the selected SKU should be reviewed against the submitted engine information. This review must include the engine serial number, model number, original gear ratio, 5.44-inch housing, prop-shaft configuration, shaft length and rotation. If the customer’s information conflicts with the selected configuration, shipment should be paused until fitment is confirmed.
The product label, condition, SKU and shaft configuration should be checked against the order. The carton should be inspected and the driveshaft, propeller shaft, skeg and housing protected during packaging.
This gearcase ships without oil. It must be filled with the manufacturer-required gear lubricant before operation. OBR also requires proper shift adjustment and a ten-hour break-in period. During the first five hours, do not exceed 75% throttle; avoid full-throttle starts and extended constant-speed operation. OBR break-in instructions
When the shipment arrives:
| Specification | Mercury Verado L6 Lower Unit | 200–400 HP | 5.44″ Heavy-Duty |
|---|---|
| Manufacturer | OBR Parts & Marine |
| Compatible engine make | Mercury |
| Engine family | Mercury Verado L6 |
| Product configuration | 5.44-inch gearcase with heavy-duty prop shaft |
| Conditions | New or remanufactured, depending on selected SKU |
| 1.85:1 application group | Selected 200, 225, 275 and 300 HP Verado L6 applications |
| 1.75:1 application group | Selected 300, 350 and 400 HP Verado L6 applications |
| Cataloged years | 2006–2021; engine serial verification required |
| Rotation | Standard rotation |
| Gear ratios | 1.85:1 or 1.75:1, depending on application |
| Shaft options | 20-inch L, 25-inch XL or 30-inch XXL |
| Model designations | L, XL and XXL |
| 1.85:1 SKUs | ME-G6-40-N/R, ME-G6-41-N/R and ME-G6-42-N/R |
| 1.75:1 SKUs | ME-G6-43-N/R, ME-G6-44-N/R and ME-G6-45-N/R |
| Gear oil | Ships without oil |
| Warranty | OBR two-year limited gearcase warranty |
| Required fitment data | Engine serial number, model number, original ratio, shaft length, rotation and prop-shaft configuration |
| Major exclusions | Counter-rotation applications, 4.8-inch gearcases, 1-inch prop-shaft families, non-L6 engines and any engine with an unmatched ratio |
The correct Mercury Verado HD prop shaft lower unit must match several specifications—not only the horsepower shown on the engine cowling. First, confirm that the existing gearcase uses the 5.44-inch housing and heavy-duty prop-shaft configuration. A visually similar 5.44-inch unit with a different propeller shaft may not be interchangeable.
Next, verify the original gear ratio. The 1.85:1 variants on this page are cataloged for selected 200, 225, 275 and 300 HP applications. The 1.75:1 variants are cataloged for selected 300, 350 and 400 HP applications. Because 300 HP appears in both groups, the serial number and original ratio are essential.
Choose the correct 20-, 25- or 30-inch shaft and confirm that the engine requires standard rotation. Counter-rotation HD variants belong to a separate configuration and should not be selected by engine position alone.
Finally, choose new or remanufactured condition and compare the selected SKU with the compatibility table. If the housing size, prop shaft, ratio, shaft length or rotation cannot be confirmed, request a fitment check before ordering.
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The product information made it easy to confirm the correct SE216 configuration needed for a Mercury Verado L6 300 HP application. The 1.85:1 gear ratio, 5.44″ heavy-duty gearcase diameter, and serial-number requirements were clearly explained. Buyers should verify their torpedo diameter and shaft length before ordering.
I appreciated that the Verado L6 5.44″ heavy-duty lower unit options were clearly distinguished from smaller 4.80″ gearcases. The 25-inch shaft, 1.85:1 ratio, and engine serial-number guidance made selecting the replacement unit straightforward. Confirming your exact gear housing diameter is key.
The product page clearly detailed the 5.44″ heavy-duty bullet requirement and gear ratio options for 200–400 HP Verado Inline-6 outboards. The 20-inch shaft unit was simple to identify, and fitment assistance saved a lot of time prior to checkout.
The most important detail for this Mercury replacement lower unit was matching the 1.85:1 ratio and 5.44″ heavy-duty gear housing size. The page made it easy to cross-reference my engine year and serial number. I recommend checking your prop shaft and gearcase dimensions first.
The heavy-duty Verado L6 specific guidance ensured I received the exact lower unit needed for my twin 400 HP setup. Arrived safely packaged in a wooden crate with zero damage. Serial-number verification with customer support prior to shipment made installation hassle-free.
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