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Required for fitment review to confirm compatibility.
The OBR Mercury Verado HD counter-rotation lower-unit family contains new and remanufactured 5.44-inch silver gearcases for selected Mercury Verado L6 applications.
For selected 200–300 HP applications, OBR lists 25-inch and 30-inch counter-rotation configurations with a 1.85:1 gear ratio. For selected 300–400 HP applications, OBR lists 20-inch, 25-inch and 30-inch counter-rotation configurations with a 1.75:1 gear ratio.
Do not order using horsepower, engine position or an assumed model-year range alone. Match the complete engine serial number, original OEM or gearcase number, housing size, rotation, gear ratio and shaft length before ordering.
Twin-Engine Precision: Dedicated Left-Hand (LH) rotation to eliminate steering torque in dual-engine configurations.
Heavy-Duty 5.44″ Housing: The oversized "Fat" torpedo design provides superior gear strength and enhanced cooling.
Offshore Performance: Optimized for the high-torque power curves of L6 Verado 200–400 HP engines.
This OBR 5.44-inch HD counter-rotation lower unit is cataloged for selected Mercury and Mariner Verado L6 applications. Compatibility depends on the engine family, horsepower range, gear ratio, shaft length, rotation and selected new or remanufactured SKU.
For selected 200–300 HP Verado L6 applications, OBR lists the following counter-rotation configurations:
For selected 300–400 HP Verado L6 applications, OBR lists the following counter-rotation configurations:
Before ordering, match the selected configuration to the complete Mercury engine serial number, original OEM or gearcase number, 5.44-inch housing size, counter rotation, original gear ratio and shaft length. Horsepower alone is not sufficient to confirm compatibility.
A universal 2006–2021 model-year range has not been confirmed for every SKU. Do not assume compatibility with standard-rotation gearcases, 4.8-inch housings, SportMaster units or later Mercury Verado V8 and V10 applications without written fitment confirmation.
Mercury Verado L6 lower unit is ordered, installed, or filled with gear oil. Selecting the wrong rotation, gear ratio, housing family, or shaft length can result in an incorrect drivetrain configuration:
Critical Ordering & Fitment Verification:
Mariners Warehouse currently states:
See the Mariners Warehouse shipping policy.
Confirm the selected SKU and physical inventory before fulfillment.
OBR states that gearcases ship without oil. The installer must use the manufacturer-required lubricant, confirm proper shift adjustment and follow the prescribed break-in procedure.
| Specification | Mercury Verado L6 HD Counter-Rotation Lower Unit | 200–400 HP |
|---|---|
| Supplier / Builder | OBR Parts & Marine |
| Compatible Engine Make | Mercury / Mariner |
| Engine Family | Selected Mercury Verado L6 applications |
| Product Family | 5.44-inch HD counter-rotation gearcase |
| Conditions | New and remanufactured, depending on selected SKU |
| Finish | Silver |
| Rotation | Counter rotation / left-hand |
| 200–300 HP Configuration | 1.85:1 ratio; 25-inch XL or 30-inch XXL |
| 300–400 HP Configuration | 1.75:1 ratio; 20-inch L, 25-inch XL or 30-inch XXL |
| Model-Year Range | VERIFY BEFORE PUBLISHING; OBR does not publish model years for these SKUs |
| New SKUs | ME-G6-42A-N; ME-G6-42B-N; ME-G6-45A-N; ME-G6-46-N; ME-G6-47-N |
| Remanufactured SKUs | ME-G6-42A-R; ME-G6-42B-R; ME-G6-45A-R; ME-G6-46-R; ME-G6-47-R |
| New-Unit Designation | OBR lists HD PS; VERIFY BEFORE PUBLISHING what PS means and whether it changes fitment |
| OEM Cross-References | Published for 1.75:1 SKUs; see compatibility table. VERIFY BEFORE PUBLISHING for 1.85:1 SKUs |
| Gear Oil | Not included; OBR states that gearcases ship without oil |
| Warranty | OBR two-year limited gearcase warranty, subject to full written terms |
| Major Exclusions | Do not substitute for standard rotation, 4.8-inch, SportMaster, later V8/V10 Verado or another ratio without exact supplier-confirmed fitment |
Start by confirming that the original lower unit is a 5.44-inch HD counter-rotation gearcase. Rotation should be verified from the existing gearcase, OEM number or engine documentation—not from the engine’s position on the transom.
Next, match the horsepower configuration and gear ratio. OBR lists the 200–300 HP family with a 1.85:1 ratio in 25-inch and 30-inch shaft configurations. The 300–400 HP family uses a 1.75:1 ratio and is offered in 20-inch, 25-inch and 30-inch configurations.
Finally, choose new or remanufactured condition and submit the complete Mercury engine serial number, original OEM or gearcase number, shaft length and a clear photo of the identification markings. The OBR listings identify this family as Verado L6; do not assume compatibility with later V8 or V10 Verado engines.
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The product information made it easy to confirm the correct SE216 heavy-duty counter-rotation lower unit for my port side Mercury Verado L6 300 HP setup. The 1.75:1 gear ratio, 25-inch shaft, and 5.44″ gearcase requirements were clearly explained. Verifying the port engine configuration before ordering saved a lot of hassle.
I appreciated that the heavy-duty counter-rotation lower unit options were clearly separated from standard right-hand rotation models. The 30-inch shaft, 1.75:1 ratio, and serial-number guidance made the selection process much clearer. Confirming the exact LH rotation prop shaft details prior to checkout is essential.
The product page clearly detailed the 5.44″ torpedo diameter requirement and counter-rotation setup for 200–400 HP Verado L6 outboards. The 25-inch shaft unit was simple to identify. The fitment warnings were extremely helpful for ordering the correct port gearcase.
The most important detail for this Mercury replacement lower unit was matching the 1.75:1 gear ratio and left-hand rotation. The page made it easy to compare engine horsepower ranges and shaft configurations. I recommend double-checking your original gear ratio and engine serial number first.
The counter-rotation specific guidance helped distinguish this unit from standard Verado gearcases. The 200–400 HP application, 1.75:1 ratio, and heavy-duty 5.44″ bullet size were clearly identified. Serial-number verification with support before shipping ensured a seamless installation on my port engine.
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