OK.....with Bravo I lower halves. Are there different gear ratios? For example:
A: 1:36 outdrive
B: 1:50 outdrive
Do they both have the same gears in the lowers and the uppers is what makes the gers ratios different?
Or do I have this wrong?
I have a few lower halves (stock) that came off of 1:36's .... So, perspective buyers ask what ratio....are the lowers.......good question.........I thought they were the same

NO 1.50 & 1.36 HAVE TOTALY DIFFERENT TOOTH COUNTS ,UPPER AND LOWER

Taz, not true. Not trying to be argumentative, but regular or XZ B1 changes ratio in the upper (3 choices), only 1 lower gear set.

XR has 1 upper ratio, changes ratio in lower (again 3 choices).

I never did try to work out all the ratios that would be available with stock upper and XR lower gears.

you are correct, LOWER ratio is changed on XR
gear count
1.5 = 15/19
1.35 = 15/17
1.26 = 17/18
with standard straight cut XR 16/19 upper gears

many combinations possible with different XZ upper gears

All Bravo One Gasoline lower gearcases have the same gears. Bravo XR and diesel have different gears.