Re: Bravo II>>> correct gear ratio
I can't tell you what the gear ratio of the old drive was, but if you get the serial number from your engine, you should be able to contact either your local certified Mercruiser dealer, or call Mercruiser yourself and find out what the ratio is.
The Bravo II drives were very common on the 24 to 28 foot cruisers, and not just for commercial boats.