what would happen if i changed the ratio from 1.81 to 2.0 on my bravo two outdrive. i have a 454 Mercrusier engine 300 HP single screw. the current outdrive case is shot. lots of corrosion. any help would be great!
Changing the gear ratio because the drive case is shot makes no sense. I agree that you would be better off ensuring you're properly propped.
drive foils like the whale's tale is giving you lift on the outdrive, which is transferring pressure to the transom assembly. The drive was not designed to have lift or plane the hull. There is a reason outdrive manufacturers have not redesigned their outdrive to include this lifting element from the factory.