Complete Sterndrive | SE104 | 1.81 Ratio | Counter Rotation

Complete Sterndrive | SE104 | 1.81 Ratio | Counter Rotation

$2,165.00
$2,403.15
$2,165.00
(-10%)
SKU: ST-GEN-I-1_81-COMPLETE-SHORT-YOKE-CR
Key Features :
  • Precision Counter-Rotation Gearing
  • Heavy-Duty Housing Construction
  • Saltwater Corrosion Resistance
Please hurry! Only 20 left in stock
Subtotal: $2,165.00
Complete Sterndrive | SE104 | 1.81 Ratio | Counter Rotation

Complete Sterndrive | SE104 | 1.81 Ratio | Counter Rotation

$2,403.15 $2,165.00
Complete Sterndrive | SE104 | 1.81 Ratio | Counter Rotation

Complete Sterndrive | SE104 | 1.81 Ratio | Counter Rotation

$2,403.15 $2,165.00

    Eliminate steering torque and restore balanced handling with this Complete Counter-Rotating Sterndrive, a premium aftermarket replacement for Alpha One Gen I systems. Engineered with a 1.81 gear ratio, this unit is optimized for 170HP to 185HP engine configurations, providing smooth power transmission and improved tracking. The assembly features an 8-1/8" Short Input Yoke and a heavy-duty gearset housed in a corrosion-resistant casing, ensuring long-term durability in both freshwater and saltwater environments.

    Ideal Applications

    • Twin-Engine Offshore Configurations

    • Mid-Sized Family Cruisers

    • Saltwater and Coastal Navigation

    • Brand: SEI
    • Part Number: GEN-I-1_81-COMPLETE-SHORT-YOKE-CR
    • OEM / Cross-Reference: SE104-CR, 90-104-02
    • Engine Compatibility: Mercruiser Alpha One (Gen I) 170/185HP
    • Year Range: 1976–1982
    • Gear Ratio: 1.81:1
    • Input Yoke: 8-1/8" (Short Style)
    • Rotation: Counter-Rotation (Left Hand)
    • Horsepower Rating: Up to 300HP
    • Drive Type: Complete Sterndrive (Upper & Lower)
    • Fits Alpha One Gen I, R, and MR models (1976–1982)
    • Optimized for 170HP and 185HP engine configurations
    • Equipped with a 1.81 Gear Ratio
    • Features an 8-1/8" Short Input Yoke
    • Verify Rotation: This is a Counter-Rotation (Left Hand) unit; do not install in a standard single-engine or right-hand position.
    • Check Yoke Length: Confirmed fit for 8-1/8" short yoke applications; will not fit drives requiring a long yoke.
    • Confirm Drive Generation: Only compatible with Gen I drives; does not fit Alpha One Gen II (1991–Present) models.

    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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