Volvo saildrive ratio

[tim]

I'm using the Castle Marine application to work out what prop is right for my boat, but I need to know what the gearbox ratio is for the Volvo saildrive. I'm not sure which one it is but it is mated to a Volvo 2003. Any info gratefully appreciated.
Thanks.

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[Will_M]

Think you'll find your 2003 has either the 120S-B or 120S-C saildrive unit, either way both have a gear reduction of 2.2:1

(although to be more correct I think from memory its more like 2.22 / 2.23:1, but dont quote us on that)

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