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A 5.0 upper has an effective ratio of 1.23 to 1. The 4.3 has a ratio of 1.10 to 1. In a very heavy boat you would want to stay with the correct ratio. On a lighter or average boat, in reality it won't make that much of a difference.
You would more than likely have to make a propeller change, or increase the pitch on yours by 2 to 3 inches.
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