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BMAX upper gears

Old 04-09-2022, 08:46 AM
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Default BMAX upper gears

I searched and found sone folks on here have used their drives with good success. Since I canít find the XZ gears Iíve been looking at some other options. Does anyone know if these are just Bravo gears or actually made by BMAX? If they are BMAX they appear helical, curious if Iíd have any issues mating them to a Bravo setup and lowers?

I plan to give them a call Monday but am impatient like most.

https://bravoshop.net/product/bmax-1-5-ratio-gear-set/

Thanks,
Todd
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Old 04-09-2022, 12:20 PM
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BMax upper gears are much larger that Bravo gears, they only fit
the BMax case.
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Old 04-09-2022, 12:40 PM
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Damn! Thanks for the info!
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Old 04-09-2022, 01:12 PM
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Originally Posted by 540Fever View Post
Damn! Thanks for the info!
have seen you post on many of the forumsÖwhat power and boat are you running? other members will be able to chime in an assess whether you will have issues running standard bravo, xz, or xrís.

they may say you need something more like a b-max or imco.

but we need to know the specifics
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Old 04-09-2022, 02:40 PM
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Originally Posted by 1MOSES1 View Post
have seen you post on many of the forumsÖwhat power and boat are you running? other members will be able to chime in an assess whether you will have issues running standard bravo, xz, or xrís.

they may say you need something more like a b-max or imco.

but we need to know the specifics
27í Fountain 540NA thatís currently being assembled. 10:1CR, Dart 320 heads, hyd roller, 1050 Dominator. Weíll dyno tune it once done but should make some good torque and probably close to 700hp.

I had them pull the drive since it was in the shop because itís a new boat to me and I noticed a little drop in the fluid reservoir - was hoping just some seals. Got into it and the XR gears were pretty shot so he recommended a rebuild with XZ gears for a little better longevity.

Theyíve been waiting on gears and it continues to push out month after month. Iíve got a house rented and already paid for the Cannonball run in June and if I donít have gears in a few weeks, no way the boat will be ready.

I was able to find the lowers and clutch, but theyíre not doing me any good without the uppers. Hence, Iíve been searching for a set of XZ uppers. My thought was maybe I could find a different gear that would work in my setup.

I know someone has a beautiful set of XZ gears collecting dust I just need to find them 😂

thanks

Last edited by 540Fever; 04-09-2022 at 02:44 PM.
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Old 04-09-2022, 10:09 PM
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Just curious, I get you want xz, but why not just replace the xr's? I'm sure you would have better luck finding someone with set of those, I searched high and low last May for my x uppers, was a joke then finding anything
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Old 04-09-2022, 11:02 PM
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Originally Posted by blownhammer2000 View Post
Just curious, I get you want xz, but why not just replace the xr's? I'm sure you would have better luck finding someone with set of those, I searched high and low last May for my x uppers, was a joke then finding anything
Honestly thatís not a bad consideration at this point.
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Old 04-10-2022, 09:24 AM
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Pretty much all gears with the exception of custom ones (IMCO, BMAX) are on back order right now. We're a Merc premier dealer, Ive had sets of XR upper gears on order since Sept 2021. The current ETA is October 2022.
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Old 04-10-2022, 11:08 AM
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Another question here.

From what I've read there is only one XR upper ratio. If I were to match that with my XZ lowers (15/19) that should give me a final ratio of 1.50. Are there any special parts required to mate the XR uppers to XZ lowers? Will the XZ clutch work for the (861781A1) - I think it will.

Thanks,
Todd
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Old 04-10-2022, 12:47 PM
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The case doesn’t matter, it’s considered an X case, you need a 32/27
tooth count X upper gear set to maintain 1.5:1 ratio, there’s about 12 different thrust races
used to set gear backlash, you would probably want the start with what you
have 1st to determine how close you are,
the clutch is the same

FWIW, unless you don’t mind
replacing gears in a short time
frame, I wouldn’t use the XR upper gearsets

Last edited by JaayTeee; 04-10-2022 at 12:55 PM.
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