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Thread: Gear ratio?

  1. #1

    Default Gear ratio?

    I have a serial # of 0D310340 on a plate on outdrive, but has no plate that shows gear ratio. Does anyone know what gear ratio is? I have another outdrive with serial # on a plate and another plate that says 1:81 for gear ratio.
    Last edited by crappieking23; 07-21-2020 at 05:43 PM.

  2. #2

    Default

    Hello. The serial number just tells which drive it is, Alpha One Gen 1. It does not give the gear ratio. The easiest way to tell is to take off the top cover on the upper and count the teeth on the gears. We can then tell what the gear ratio is.
    Brunswick Corporation is the original equipment manufacturer (OEM). Sterndrive Engineering, Inc. (or SEI) is not affiliated with the Brunswick Corporation and is not authorized to sell or service Brunswick products.

  3. #3

    Default

    Thanks for the info, I will check the teeth. The other outdrive I have has a serial # of 0M490785, is it a Alpha One Gen 2? Can you use parts off of Gen 1 on a Gen 2 if gear ratio the same?

  4. #4

    Default

    The parts are not interchangeable from a Gen 1 to a Gen 2 or visa versa. Serial number 0M490785 is a Gen 2 Alpha drive.
    Brunswick Corporation is the original equipment manufacturer (OEM). Sterndrive Engineering, Inc. (or SEI) is not affiliated with the Brunswick Corporation and is not authorized to sell or service Brunswick products.

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Sterndrive Engineering, Inc. (SEI) manufactures a stern drive designed to replace Mercury Marine's MerCruiserŽ Alpha OneŽ, R, MR, Gen II and Bravo OneŽ stern drives. MerCruiserŽ Alpha One, R, MR, Gen II and Bravo OneŽ are trademarks of the Brunswick Corporation. SEI has no affiliation with the Brunswick Corporation. Consequently, any warranties governing products and or sold by Brunswick Corporation will not apply to products manufactured and or sold by SEI, or to products damaged due to the operation of an SEI product.