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Required for fitment review to confirm compatibility.
The OBR Mercury Verado inline-6 lower unit is a replacement gearcase offered in new and remanufactured configurations for selected 200, 225, 250, 275 and 300 HP Verado applications. Available configurations include 20-inch, 25-inch and 30-inch driveshaft lengths, with standard and counter-rotation options identified by individual OBR SKUs.
The 200–275 HP catalog family begins with 2005 applications, while the listed 300 HP family begins with 2006 applications. OBR identifies the listed 300 HP units as 4.8-inch Verado gearcases. Exact fitment must be confirmed using the complete engine serial number, original gearcase or OEM number, driveshaft length and required rotation.
Horsepower or external appearance alone cannot confirm compatibility. Select the condition and configuration carefully, then provide the engine serial number before checkout.
This listing contains multiple OBR lower-unit configurations and is not a universal 200–300 HP fitment.
For selected 200, 225, 250 and 275 HP Verado applications:
For selected 300 HP Verado 4.8-inch applications:
Fitment is not confirmed until the selected OBR SKU is matched to the complete Mercury engine serial number, original gearcase/OEM number, required rotation and driveshaft length. Exact model suffixes and gear ratios must be verified before publication and purchase.
Orders are normally processed within 1–2 business days. Delivery estimates and shipping charges depend on the destination, shipment dimensions and selected service.
OBR gearcase assemblies ship without gear oil. Fill the unit with the lubricant and quantity required by the engine manufacturer before operation. Proper shift adjustment is essential. During the first 10 operating hours, vary engine speed, avoid full-throttle starts and follow OBR’s published lower-unit break-in procedure.
Do not install the unit until the selected OBR SKU, shaft length, rotation and original application have been confirmed.
Mariners’ published delivery estimates are 3–7 business days for standard shipping, 2–3 for expedited and one business day for overnight service, subject to location and delays. Shipping policy
| Specification | Mercury Verado Inline-6 Lower Unit | 200–300 HP |
|---|---|
| Manufacturer | OBR Parts |
| Product Type | Replacement outboard lower-unit/gearcase assembly |
| Conditions | New and remanufactured, depending on selected SKU |
| Engine Family | Selected Mercury Verado four-stroke inline-6 applications; verify complete engine serial number |
| Horsepower | 200, 225, 250, 275 and 300 HP, depending on SKU |
| Verified Catalog Years | 200/225/250/275 HP: 2005-up; 300 HP: 2006-up |
| Shaft Options | 20-inch L, 25-inch XL and 30-inch XXL, depending on SKU |
| Rotation | Standard or counter rotation, depending on SKU |
| 300 HP Gearcase | OBR catalog identifies the listed 300 HP configurations as 4.8-inch |
| OBR SKU Families | ME-G6-18 through ME-G6-22 and ME-G6-30 through ME-G6-36; N means new and R means remanufactured |
| Major Exclusions | Do not assume fitment for 5.44-inch, Torque Master, Sport Master or later V6/V8 Verado applications |
| Required Customer Information | Complete engine serial number, original gearcase/OEM number, horsepower, shaft length and rotation |
Choosing an OBR Mercury Verado inline-6 lower unit starts with the exact gearcase configuration, not horsepower alone. First, locate the complete engine serial number and any Mercury or OBR number on the original assembly. These identifiers help separate visually similar gearcases that may use a different shaft length, rotation or housing family.
Next, identify the required driveshaft length. The OBR variants on this page include 20-inch L, 25-inch XL and 30-inch XXL configurations. Then confirm rotation from the existing gearcase and propulsion setup. Standard and counter-rotation units are different products; the position of an engine in a multi-engine installation should not be used as the only confirmation.
Finally, match the original gear ratio and housing type. The listed 300 HP configurations are identified by OBR as 4.8-inch gearcases, but ratio mapping and some 200–275 HP technical details still require supplier verification. If any identifier is unavailable, submit the engine serial number and clear photos before ordering. Do not install the unit until the selected SKU has been confirmed.
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The product information made it easy to confirm the correct lower unit configuration for my Mercury Verado 250 HP Inline-6. The 1.85:1 gear ratio, 25-inch shaft length, and engine serial-number requirements were clearly laid out. Verifying all application details before ordering made installation seamless.
I appreciated how clearly the Verado Inline-6 configurations were separated from other V6 models. The 20-inch shaft, 1.85:1 gear ratio, and serial-number checks made the selection process smooth. A great replacement option for Verado 200–300 HP outboards.
The product page gave detailed specifications on shaft lengths and gear ratios for the Verado Inline-6 series. Identifying the correct 1.85:1 unit for my 300 HP outboard was straightforward. Checking the complete engine serial number is essential prior to checkout.
Matching the 1.85:1 ratio and shaft dimensions was the most critical step for my Mercury Verado 225 HP. The specifications allowed for quick comparison against my existing setup. Packaging was solid and delivery was prompt.
Clear fitment details made selecting the right lower unit for a Verado 200 HP Inline-6 simple. The 25-inch shaft and serial-number verification guidelines saved a lot of guesswork during ordering. Bolted right up to the engine midsection without issue.
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