New Mercury 135-150 HP V6 Outboard Lower Unit DFI – 2:1 Gear Ratio (1979–2014) – New / Re-manufactured image 0
New Mercury 135-150 HP V6 Outboard Lower Unit DFI – 2:1 Gear Ratio (1979–2014) – New / Re-manufactured image 0

OBR Replacement Lower Unit for Mercury 135–150 HP V6 | 2.00:1

$2,959.00
$3,284.49
$2,959.00
Product type: Lower Unit
Please hurry! Only 100 left in stock
Subtotal: $2,959.00

Required for fitment review to confirm compatibility.

10 customers are viewing this product
Two-Year OBR Limited Warranty
Engine Serial Number Required
New and Remanufactured Options
20-Inch and 25-Inch Configurations
New Mercury 135-150 HP V6 Outboard Lower Unit DFI – 2:1 Gear Ratio (1979–2014) – New / Re-manufactured image 0

OBR Replacement Lower Unit for Mercury 135–150 HP V6 | 2.00:1

$3,284.49 $2,959.00
New Mercury 135-150 HP V6 Outboard Lower Unit DFI – 2:1 Gear Ratio (1979–2014) – New / Re-manufactured image 0

OBR Replacement Lower Unit for Mercury 135–150 HP V6 | 2.00:1

$3,284.49 $2,959.00
Product Type: New Lower Unit
HP/Shaft/Years/Ratio: New | 20-Inch L | Standard Rotation |

    The OBR replacement lower unit for Mercury 135–150 HP V6 outboards is available in new and remanufactured configurations. The listed standard-rotation gearcases are offered with a 20-inch L or 25-inch XL driveshaft and are intended for selected Mercury V6 two-stroke and 135 DFI applications.

    Choose the ME-G6-03A family for a 20-inch L configuration or the ME-G6-04A family for a 25-inch XL configuration. The -N suffix identifies a new gearcase, while -R identifies a remanufactured gearcase.

    Horsepower and model year alone cannot confirm fitment. Before ordering, provide the complete engine model and serial number and verify the existing shaft length, gear ratio, and rotation. Counter-rotation, 1.87:1, four-stroke, and Verado applications require a different gearcase.

    • High-Torque 2:1 Ratio: Perfectly geared for heavier hulls and high-acceleration requirements.

    • V6 Strength: Built to handle the high-load demands of 135HP and 150HP powerheads.

    • Superior Protection: Advanced marine-grade finish for maximum corrosion resistance in saltwater.

     

    Quick Fitment Summary

    Specification OBR Replacement Lower Unit for Mercury 135–150 HP V6 | 2.00:1
    Manufacturer OBR Parts & Marine
    Compatible Engine Make Mercury
    Product Family ME-G6-03A / ME-G6-04A
    Product Type Replacement outboard lower unit / gearcase
    Condition Options New and remanufactured
    Engine Family Selected Mercury V6 two-stroke and 135 DFI applications
    Horsepower 135 HP and 150 HP
    Year Coverage 1979-2001
    Gear Ratio 2:00:1
    Rotation Standard / right-hand
    Shaft Options 20-inch L and 25-inch XL
    Gearcase Family 4-3/4-inch hub family
    New SKUs ME-G6-03A-N and ME-G6-04A-N
    Remanufactured SKUs ME-G6-03A-R and ME-G6-04A-R
    Model Suffixes New & Remanufactured
    Anodes / Zincs Not included according to the available exact-SKU fitment table
    Gear Lube Not included; gearcase ships without oil
    Warranty Two-year OBR limited warranty
    Required Fitment Information Engine model and serial number, horsepower, model year, shaft length, gear ratio and rotation
    Major Exclusions Counter-rotation, 1.87:1, four-stroke, Verado and unverified engine applications

    How to Choose the Correct Mercury 135–150 HP V6 Lower Unit

    Choosing the correct Mercury 135–150 HP V6 lower unit starts with five identifiers: the complete engine model and serial number, shaft length, gear ratio, rotation and desired condition. This page covers the OBR ME-G6-03A and ME-G6-04A standard-rotation families.

    Choose an ME-G6-03A variant for a 20-inch L shaft or an ME-G6-04A variant for a 25-inch XL shaft. The -N suffix identifies a new gearcase, while -R identifies a remanufactured gearcase. Although current supplier listings identify selected 135–150 HP V6 and 135 DFI applications, horsepower and year alone do not provide a complete fitment match.

    Do not use these four variants for a counter-rotation setup, a 1.87:1 application, a four-stroke engine or a Verado. If the existing unit is marked SEI 90-206 or uses a different rotation, compare the alternative product below or request a fitment review. The gearcase ships without oil, so installation must include the correct manufacturer-specified gear lubricant and the applicable OBR break-in procedure.

    Application / Compatibility Guide

    Use CTRL + F or search below to find your engine model

    Loading compatibility data...

    What Customers Say

    Clear fitment process for Mercury 150 HP V6

    The product information made it easy to confirm that this OBR replacement unit matched my Mercury 150 HP V6. The 2.00:1 gear ratio, 20-inch shaft length, and serial-number compatibility guidance were spot on. Always verify your gear ratio before placing an order.
    Caleb Montgomery Verified buyer
    July 2026

    Helpful V6-specific gearcase guidance

    I appreciated that the OBR 135–150 HP V6 page specifically highlighted the 2.00:1 gear ratio requirements. Mariners Warehouse fitment support confirmed my engine year and shaft configuration before shipping, which gave me complete peace of mind.
    Gavin Holbrook Verified buyer
    April 2026

    Direct replacement for 135 HP V6 outboard

    The unit arrived securely secured in heavy-duty foam packaging. The drive shaft splines and 20-inch shaft lined up perfectly on my 135 HP V6 engine block. Shifts crisp and runs smoothly after completing the recommended break-in hours.
    Tristan Archer Verified buyer
    December 2025

    Great performance, unboxing took extra effort

    Matching the 2.00:1 gear ratio and engine specs was very easy. The replacement lower unit performs great out on the water, though removing the shipping frame and bracket took a bit of extra time during setup.
    Landon Cross Verified buyer
    September 2025

    Solid gearcase for 25-inch shaft V6 application

    Replaced the damaged lower unit on my Mercury 150 HP V6. The listing clearly detailed shaft length parameters and fluid fill steps. After following the proper break-in guidelines, it has performed without a single issue.
    Preston Delaney Verified buyer
    February 2024

    Frequently Asked Questions

    Will this lower unit fit every Mercury 135 HP or 150 HP outboard?
    No. Current supplier listings identify selected Mercury V6 two-stroke and 135 DFI applications, but horsepower alone cannot confirm fitment. The complete engine model and serial number, shaft length, gear ratio and rotation must be verified.
    What model years does this product cover?
    Current exact-SKU listings show 1979–2014, while another available fitment table shows 1979–2001. VERIFY BEFORE PUBLISHING and confirm every order by engine serial number.
    Which Mercury model suffixes are compatible?
    VERIFY BEFORE PUBLISHING
    Are these standard-rotation or counter-rotation lower units?
    The listed ME-G6-03A and ME-G6-04A variants are standard/right-hand-rotation configurations. Counter-rotation ME-G6-05A products are separate and are not included in the current selector.
    Which SKU is used for each shaft length?
    ME-G6-03A-N and ME-G6-03A-R are the 20-inch L options. ME-G6-04A-N and ME-G6-04A-R are the 25-inch XL options.
    What gear ratio and driveshaft spline does this lower unit use?
    The product and supplier titles identify a 2.00:1 ratio, but the supplier body uses conflicting notation. The exact driveshaft spline or tooth count is not published. VERIFY BEFORE PUBLISHING.
    What is the difference between the new and remanufactured variants?
    The -N SKUs are sold as new gearcases and the -R SKUs are sold as remanufactured gearcases. Both conditions carry the OBR two-year limited warranty. The exact remanufacturing and testing checklist is VERIFY BEFORE PUBLISHING.
    Does the lower unit arrive with gear oil?
    No. OBR states that its gearcase assemblies ship without oil. Fill the unit with the manufacturer-required marine gear lubricant before operation and follow the OBR break-in procedure.
    Are the water pump, anodes and installation hardware included?
    The available fitment table states that anodes are not included. Water-pump components, gaskets, propeller hardware and installation hardware are VERIFY BEFORE PUBLISHING.
    Is there a core charge or core return?
    VERIFY BEFORE PUBLISHING
    What warranty applies?
    OBR provides a two-year limited warranty on new and remanufactured gearcases. Coverage is limited to repair or replacement after OBR inspection and excludes outside labor, improper installation, misuse, corrosion, modification and other stated exclusions.
    Can I return the lower unit after installation?
    No. Mariners Warehouse states that assembled, installed, used or rented items cannot be returned. Eligible uninstalled returns must be requested within 14 days from shipment, require authorization and are subject to the published return terms.

    Related Products

    Example product title
    From $2,689.00
    $2,984.79
    From $2,689.00
    Example product title
    From $2,689.00
    $2,984.79
    From $2,689.00
    Example product title
    From $2,689.00
    $2,984.79
    From $2,689.00
    Example product title
    From $2,689.00
    $2,984.79
    From $2,689.00
    Example product title
    From $2,689.00
    $2,984.79
    From $2,689.00
    Example product title
    From $2,689.00
    $2,984.79
    From $2,689.00
    Example product title
    From $2,689.00
    $2,984.79
    From $2,689.00
    Example product title
    From $2,689.00
    $2,984.79
    From $2,689.00
    Example product title
    From $2,689.00
    $2,984.79
    From $2,689.00
    Example product title
    From $2,689.00
    $2,984.79
    From $2,689.00

    Need Help?

    Still Can't Find the Right Marine Part?

    Finding the right replacement part shouldn't be frustrating. If you can't locate the marine part you need, our experienced support team is here to help. Whether you have a part number, engine model, or simply need expert guidance, we'll help you find the correct replacement so you can get back on the water with confidence.

    Contact Marine Experts Browse All Marine Parts

    Trusted by 50,000+ boat owners across the USA

    A man wearing a navy blue polo shirt with a circular logo sits at a desk holding a metal engine component, with a laptop in front of him and a boat propeller on the table. A dark blue informational overlay on the right lists benefits like 'Talk to an Expert' and 'Find the Right Part'.

    • Expert Marine Support

      Our team has years of experience in marine parts.

    • Fast Response

      We respond quickly to get you the help you need.

    • Find Compatible Parts

      We make sure you get the right part the first time.

    • Huge Selection

      Access to 50,000+ marine parts & accessories.

    Have a Part Number or Engine Model?

    Send it to us and our experts will help you find the exact part you need.

    Browse Our All Lower Units

    Yamaha Outboard Lower Unit
    Shop Now
    Yamaha Outboard Lower Unit
    18 Products
    Suzuki Outboard Lower Unit
    Shop Now
    Suzuki Outboard Lower Unit
    2 Products
    Mercury Outboard Lower Units
    Shop Now
    Mercury Outboard Lower Units
    30 Products
    OMC Cobra Lower Unit
    Shop Now
    OMC Cobra Lower Unit
    2 Products
    Evinrude & Johnson Lower Unit
    Shop Now
    Evinrude & Johnson Lower Unit
    7 Products

    Recently Viewed Products