SE316 Magnum Lower Unit | 90-316-A | Johnson Evinrude 1.85 Gear Ratio

SE316 Magnum Lower Unit | 90-316-A | Johnson Evinrude 1.85 Gear Ratio

$1,395.00
$1,548.45
$1,395.00
(-10%)
SKU: ST-90-316-A
Key Features :
  • Heavy-Duty Saltwater Corrosion Resistant Finish
  • Precision 1.85:1 Gear Ratio Performance
  • Backed By 3-Year Fault-Free Warranty
Please hurry! Only 99 left in stock
Subtotal: $1,395.00
SE316 Magnum Lower Unit | 90-316-A | Johnson Evinrude 1.85 Gear Ratio

SE316 Magnum Lower Unit | 90-316-A | Johnson Evinrude 1.85 Gear Ratio

$1,548.45 $1,395.00
SE316 Magnum Lower Unit | 90-316-A | Johnson Evinrude 1.85 Gear Ratio

SE316 Magnum Lower Unit | 90-316-A | Johnson Evinrude 1.85 Gear Ratio

$1,548.45 $1,395.00

    Don't let a failing gearcase keep your high-horsepower outboard off the water. This Premium Aftermarket Replacement for Magnum and Mag II lower units delivers heavy-duty reliability with a precision 1.85:1 Gear Ratio and a sleek Black Finish for seamless integration and maximum propulsion.

    • High-Speed Cruising: Engineered to withstand the extreme torque of V6 135HP to 300HP outboards.

    • Direct Repower: The definitive, cost-effective fix for replacing obsolete OEM Magnum gearcases.

    • Brand: SEI
    • Part Number: SE316 (90-316-A)
    • Cross-Reference/OEM: Premium Aftermarket Replacement for 5007699, 5009081, 5009259, 5007705
    • Engine Compatibility: Johnson / Evinrude V6 (135HP - 300HP)
    • Year Range: 2002–2012
    • Gear Ratio: 1.85:1
    • Physical Specs: Black Finish, Mag II Style, Requires Reusing Original Screens
    • Fits 2002-2012 Johnson/Evinrude outboards (135HP - 300HP) originally equipped with a Magnum or Mag II gearcase.
    • Replaces OEM part numbers: 5007699, 5009081, 5009259, 5007705, 5009082, 5009260.
    • 3.4L Engine Water Pump Note: For 3.4L engines, you must either purchase OEM kit #5007972 OR reuse your old water tube grommet, o-rings, and plastic housing cover with our standard kit.
    • Missing Components: Does NOT include an upper driveshaft, shift shaft, water pump, or water intake screens (you MUST reuse your original intake screens).
    • Original Mag Replacement: If you are replacing an original Magnum (not the Mag II), you MUST remove the alignment pins from this new lower unit before installation.
    • Shaft & Spline Verification: Always verify your exact Shaft Length (20", 25", or 30") and driveshaft Tooth/Spline Count prior to ordering to ensure correct fitment.

    Mariners Warehouse vs Others

    Built to match OEM standards while delivering reliable performance and peace of mind.

    Features

    Mariners Warehouse

    Others
    Performance ✔️ ❌
    Warranty Support Reliable warranty Limited or unclear warranty terms
    Customer Trust Trusted by thousands of marine customers Unverified buyer trust
    Pre-tested before shipping for reliability ✔️ ❌
    OEM performance standards ✔️ ❌
    Simple return process ✔️ ❌

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