Outdrive gear ration question

Rapidroy5858Rapidroy5858 Member Posts: 2 ✭
in Rinker Express Cruisers Forum
Would anyone know what gear ratio I would have in my 2003 312 FV?
I need to replace a cracked lower unit but I cannot find anything indicating the gear ratio of the drive.
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  • aero3113aero3113 Member Posts: 9,073 ✭✭✭✭✭
    I would think 2.20.1 but look for the tag, it’s on the upper unit usually covered in paint. Here are both of mine.


    2008 330EC
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  • PickleRickPickleRick Member Posts: 4,038 ✭✭✭✭✭
    edited December 15
    You can use the engine serial number to look it up via mercruiser dealer.  Assuming it was properly registered.  You'll be able to get the drive serial number off of the registration.  Good idea to keep these numbers saved. 

    SEI engineering is now selling bravo 1 and bravo 3 uppers and lowers if you end up looking for a cheaper alternative to mercruiser. 
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  • Rapidroy5858Rapidroy5858 Member Posts: 2 ✭
    So today I found the engine/drive info ( see pic) card that came with the boat originally, called Mercury to see if they could use the serial # for the drive off the card, the mercury guy told me the serial # indicated the boat came with bravo 2's .. every 312 I look at online shows Bravo 3's.. I def have bravo 3 drives. 
    Now I am really confused
    Wondering if the wrong info was filled out on the info card. 
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