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SCX or SCX-4

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Old 04-30-2020, 07:50 AM
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Originally Posted by endeavour32
I have considered the NXT, however it is a lot of work to convert vs an SCX. Plus the NXT transmission is a weak link when you get over 700 hp, and if I had to guess, in stock form, the SCX is stronger. Yes you can replace the NXT transmission with the BAM conversion but that is $15k plus. If I could find a good deal on an NXT set up, I would consider it. As far as costs go, SCX-4 used maybe $22-23k. SCX uppers used- maybe $16K.

The Six is just too heavy. They only made a few 39 with 6's. The Bravo and NXT boats are better balanced. Plus with the Six, you would have to move the engines from a full stagger to a short stagger. There isn't room to run a full stagger. I want to keep the engine low in the boat, so anything with a velvet transmission is out. Otherwise, I would have installed the Arneson setup I had. That would clearly be the best option, but that is way too much work!

So the best option for this boat is, SCX or NXT. If I leave the engines as they are, maybe Bravos with Drive Guardians.
just to clarify a couple things, a number six 39 is not too heavy at all. Actually they are better balanced in every way. They get on plane almost instantly and are a couple mph faster than a nxt boat. Most people think the opposite but it just isn’t true, the bullet on the 6 is just so efficient and gets through the water so well. Every 39/700 boat built after 2012 came with 6’s so there’s more out there than you think. I agree for you the best and easiest option will be a scx upper and whatever lower you choose. It’s a proven setup, the prop of choice seems to be a labbed 32 maximus
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Old 04-30-2020, 10:25 AM
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Originally Posted by F-2 Speedy
Both of these drives require a transmission which he doesn't have.............its a bravo boat,
Gee thank you... Adding some transmissions isnt the end of the world as if its dual drive shaft, i would imagine you could shorten the drive shaft to accommodate the trans...
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Old 04-30-2020, 09:29 PM
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Originally Posted by 315duramax
Gee thank you... Adding some transmissions isnt the end of the world as if its dual drive shaft, i would imagine you could shorten the drive shaft to accommodate the trans...
Not all of us are lucky enough to have dads that buy us transmissions...



Last edited by 1MOSES1; 04-30-2020 at 09:54 PM.
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Old 04-30-2020, 10:07 PM
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Originally Posted by 315duramax
Gee thank you... Adding some transmissions isnt the end of the world as if its dual drive shaft, i would imagine you could shorten the drive shaft to accommodate the trans...
There is no way to move the engines forward for the transmissions with a full stagger. Right now, I have 1" in front of the the forward engine and the bulk head. The only way to run 6's in a 39 is to run the engines in a short stagger, or run NXT transmissions. Then if you move the engines, you need to glass the transom, buy new pipes, and many other things. For the HP I'll be running the SCX is just about as good, and I can do the swap in a day.

HA, it is far too easy to let these projects snowball out of control. The next thing you know, you have $100k wrapped up in your drive upgrade. When I looked at the boat, I knew the Bravos were coming off, but the upgrade had to be easy. Sure the ultimate set up might be 6s with NXT transom assemblies , and the BAM NXT transmission upgrade. However, when all is said and done, you would have an easy $100k into that.

I do appreciate the opinions, however, this needs to be a no glass work project.

Last edited by endeavour32; 05-01-2020 at 04:21 AM.
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Old 05-01-2020, 05:59 AM
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The BAM trannies also add another 6-7” of set back I believe. That would have to be figured in your X dim then. And then you really have these drives with cleavers hanging out past the swim platform.
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Old 05-01-2020, 07:54 AM
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To be factual, 700 w/ M6's are full stagger. 850 & 1075 is short stagger.
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Old 05-01-2020, 08:14 AM
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Originally Posted by 315duramax
Gee thank you... Adding some transmissions isnt the end of the world as if its dual drive shaft, i would imagine you could shorten the drive shaft to accommodate the trans...
maybe you should stick to glass work......
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Old 05-01-2020, 08:28 AM
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Originally Posted by IGetWet
The BAM trannies also add another 6-7” of set back I believe. That would have to be figured in your X dim then. And then you really have these drives with cleavers hanging out past the swim platform.
the boxes add 6”. The rear transmission sits half inside the box so engines stay in the same place.
very rare for a v bottom to have 2 driveline setups vs 1 plug in and 1 driveline. I know the silver 39 gtx did but again it’s rare
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Old 05-01-2020, 08:53 AM
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Originally Posted by 1MOSES1
Not all of us are lucky enough to have dads that buy us transmissions...

LOL thats odd. My dad works for me now... so, since he runs my books, and tells me what i can and cant spend to keep the company profitable, technically you would be right... i guess he does by me transmissions LOL

Originally Posted by Unlimited jd
the boxes add 6”. The rear transmission sits half inside the box so engines stay in the same place.
very rare for a v bottom to have 2 driveline setups vs 1 plug in and 1 driveline. I know the silver 39 gtx did but again it’s rare
Gotcha, i was not sure, i figured for the sake of, drilling new bolt holes for a 6 box, and shortening drive shafts it would be a better choice. I did not know it was rare for double drive shafts. or that a 39 needed to be semi stagger. Good luck with your project mike!
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Old 05-01-2020, 03:48 PM
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Originally Posted by F-2 Speedy
You had to install the SCX ITS helmet for the set up correct.
Yes, sorry for the delayed response
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