Looking at a boat with a 1.50 Bravo One X and it desperately needs a Bravo 3 on it. Is it possible to just swap the lowers or do I need to swap uppers also?

Also, how much should I expect to pay for the conversion?

You can swap lowers. A b3 lower on the 1.5 upper would give you a 2.00:1 ratio. The b3 x lower would probably be 2500-3500 depending on condition new or used.

......and then comes the $1000-$1500 prop set. I am in the process of changing out the lower on my B1 to a B3. We are changing some gears to end up with a 1.65 gear ratio and will begin testing with a 28P cupped prop set. Who knows what I will end up in it when complete? I guess that I will at least have a Bravo 1 lower and a 28, 30, and 32 p props to sell in order to fund it.

Thanks guys. They said they might have a Bravo 3 lower to put on it so I have my fingers crossed its included in the deal.

Why does it need a B3?

There are plenty of B1 props that can give you different performance characteristics.

The B3 is slower on a given hull. Just wondering.

MC