gear ratio's
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gear ratio's

  1. #1
    the real honcho bagged97taco's Avatar
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    Default gear ratio's

    I have an 83 omega i/o 305 rated @ 220hp with a alpha one drive. I blew my drive over fathersday weekend. How do I know what gear ratio I have? Any help would be great.

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  3. #2
    Senior Member sdpm's Avatar
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    On the port side of the upper drive where the Mercruiser decal is, there is a serial # as well as the gear ratio stamped into that sticker. It's about 6" to 7" below the top of the outdrive.

  4. #3
    the real honcho bagged97taco's Avatar
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    Thanks for the help.

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    Senior Member GT Jets's Avatar
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    FWIW,

    You should have a 1.65:1 gear ratio...

    GT
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

  7. #5
    It's what we do BDMarine's Avatar
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    If you can't read the ratio on the outside you can count the teeth in the upper housing.
    It would be very rare if they were not one of the ones listed below.

    1.65 = 24/24
    1.50 = 20/22
    1.84 = 17/19
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    B & D Marine Performance
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  8. #6
    the real honcho bagged97taco's Avatar
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    Thanks for the help again... couldn't read the serial number and half of my teeth on the gears are gone. But pretty sure its the 1.65to1. What are the chances the lower unit is bad? Haven't torn it apart yet. But having all the pieces of metal running through the drive can't be good.

  9. #7
    It's what we do BDMarine's Avatar
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    It's bad. Bearings for sure and the gears are 27 years old....

    You should still be able to count the gear teeth.
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    B & D Marine Performance
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