A Bravo 2 is a large lower case drive meant for commercial apps and houseboats. It’s made to swing a large diameter prop. Are you sure it’s a Bravo 2?

Your 4.3 only needs an Alpha and they are rather cheap across the board. Stick with what you got.

My guess is you mean a B1 and if you have an Alpha on it now, the Bravo will not fit. Would have to replace the transom assembly

I was told it was a bravo 2. But it was on a speed boat so probably a bravo 1 then with an LS6. I have the complete step up including the blown up LS6.

Having the complete Bravo setup (transom assembly to prop), then yes the bravo drive shaft will fit into the Alpha coupler

Yep. And the outer plate on the gen 2 and bravo is the same so it won’t need any holes drilled. You would need the seawater pump.

Bravo will weigh more and take more power to turn. You would need to see what ratio it is. That all being said I would buy and sei and use it. A lot less work and they boat will run better.

The transom assembly is different.....so the motor has to come out to replace the entire transom assembly.
The Alpha has a water pump INSIDE the drive....the Bravo does not (requires engine mounted seawater pump).
I believe the B2 is a deeper running/bigger drive meant for express cruisers. Will likely run too deep on your boat AND the prop likely has to be switched.


SEI makes a Alpha knockoff that comes with a good warranty......just buy one of those.

I can’t answer your question but to help clarify what you have, here’s the Bravo 1 and Bravo 2.
The Bravo 2 is the one with the straight/vertical trailing edge. It’s like an overweight commercial version of the sportier B1.




RR