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  1. gg1919

    Converting a SM-M drive to duo prop - ratios?

    I'm looking to convert my single prop SX drive to a duo prop. I have a 2006 Four Winns H240 w/ a VP 5.7GI. I've read places that it's only the lower unit that needs to be changed. My drive has a tag on it that says it's a 1.51 ratio, but the duo prop drives appear to be 1.95 for my boat...
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