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Old 06-25-2019, 09:29 PM
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RCV Performance CVJ44JK35 Ultimate 35 Spline CV Axles

So what's the scoop on these axles? Is it true they're better than the stock (2017) rubicon axles?



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I have to do my seals this Summer and I'm thinking of an upgrade on the joints. Don't like the stock ones.


They have the 30 spline and the 35 spline. Which one for a 2017 rubi?

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Old 06-25-2019, 09:44 PM   #2
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30 spline is stock, 35 spline if you have an arb locker that accepts 35 spline shafts. the benefit of rcv shafts is that you wont have the axle bind at full lock like you do with u-joints.
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Old 06-25-2019, 09:52 PM
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Yeah.. thanks for that.


I'm just thinking here.... so many axle seal leaks are reported and I'm wondering if u joint binding forces that issue. Even on a soft surface like snow you can feel that jerking on the steering wheel on hard turns. That shaft MUST be torquing and bending quite a bit inside the tube on a hard turn. I know that cv joints don't have that issue.


I have to open it up sometime this summer to change the seals. If I have it open, it won't take much more to change out those joints too.


It's awfully expensive though. I remember buying a new shaft (with cv joint) for my mini van. It cost maybe 300 bucks.
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Old 06-25-2019, 10:15 PM   #4
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These are what you want for a Rubicon with stock locker.

https://www.rcvperformance.com/ultim...07-and-up.html

I just bought a set, arrived today.






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Old 06-25-2019, 10:17 PM
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Originally Posted by loud0g40oz View Post
These are what you want for a Rubicon with stock locker.

https://www.rcvperformance.com/ultim...07-and-up.html

I just bought a set, arrived today.






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Keep me updated on the install and let me know how they feel..... I may be right behind you.
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Old 06-25-2019, 10:54 PM   #6
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One of the best upgrades I've done. The beauty is losing steering bind. Along with hydroassist, I can one finger turn locked 37s steering stop to steering stop and no bind.

Make sure to keep the little roundish install tool that comes with them.

Make sure to regularly give them a shot of the grease - like every or at least every other oil change or so. Most of the folks you hear rant about them they will complain about clicking - it is because they didn't maintain them and the little ball bearings start trying to jump out of the little cage and wear grooves I think is what causes it. Take care of them and they will live a long happy life.

The rebuild kits are fairly straight forward when it comes time. A driveway job.

You can buy spare or replacement orange covers. RCV I see also does cool color axle caps. Because being color coordinated matters lol.
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Old 06-25-2019, 10:59 PM   #7
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The big benefit of these is strength. They are *a lot* stronger than the stock axles. I run the equivalent of these on my 5000lb 4runner on 39.5" Rockers, and have never broken one. One started clicking, so I replaced it, but it was 9 years old.

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Old 06-26-2019, 08:42 AM   #8
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It is a significant upgrade in a couple ways. For one, the shafts themselves are made from chromoly alloy and that is a significant increase in strength over a stock Rubicon shaft material. The second, and the true benefit to the RCV design is the constant velocity joint instead of the universal joint design. A u-joint is less efficient at transferring power as the angle of the joint increases. What does this loss of efficiency mean? Binding and breakage. This is why you want to avoid too much skinny pedal when fully turned driver or passenger. The CV joint in the RCV shafts are much more efficient at transferring power at high angles reducing or eliminating bind in the joint and therefore breakage.
They are certainly a very solid upgrade over the stock Rubicon shafts when the time comes to replace them.
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Old 06-26-2019, 09:44 AM   #9
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What all others have said, these are one of the best upgrades I have made.

They are stronger and they don't bind in turns.

If somehow you manage to break one, RCV will replace it, no questions asked. (as long as you didn't exceed the recommended tire size for the axle shafts you bought)
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Old 06-26-2019, 10:35 AM   #10
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We love ours and it's been a great upgrade so far. We haven't been able to go rock crawling since the install but that will happen soon. The peace of mind of having strong axke shafts and better joints is worth the price. I will say that the steering seems a lot stuffer since the install. If you'd like to see a bit more about it or to see how they hold up off road, follow us on Instagram at kodathejeep.

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Old 06-26-2019, 12:13 PM
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I ordered a set this morning. Expensive! I think in the States they're something like $1200. In Canada they're about $1650! (0ur dollar is worth about $0.73US right now)


But I'm pretty sure this will minimize shaft seal issues. That's what I'm hoping anyway.
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Old 06-26-2019, 02:41 PM   #12
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I ordered a set this morning. Expensive! I think in the States they're something like $1200. In Canada they're about $1650! (0ur dollar is worth about $0.73US right now)


But I'm pretty sure this will minimize shaft seal issues. That's what I'm hoping anyway.
Did you get the outer front axle seal widgets to go with them?
The RCV version is over $100. There are cheaper versions, but I plan on going with the RCV version when I go that route.
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Old 06-26-2019, 06:44 PM
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Did you get the outer front axle seal widgets to go with them?
The RCV version is over $100. There are cheaper versions, but I plan on going with the RCV version when I go that route.

I looked at those and I'm not really convinced they're a great idea. It seems to me that they could be just as good at trapping water in as they are at keeping crud out.
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Old 06-26-2019, 06:50 PM   #14
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Quote:
Originally Posted by Hedgehog2JKU View Post
30 spline is stock, 35 spline if you have an arb locker that accepts 35 spline shafts. the benefit of rcv shafts is that you wont have the axle bind at full lock like you do with u-joints.
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Old 06-26-2019, 11:11 PM   #15
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I agree. They are the best. I had them on my 08. Super smooth turning even on pavement.
When the time comes to do front UJoints I’ll put new RCVs in.


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Old 09-10-2019, 12:17 PM
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Finally got around to getting these in. Changed the (leaking) seals out too. Nice axles. No u-joint binding on hard 4wd turns! A bitch getting the hubs off! They kind of rust into position. I suppose it would have been easier if I just ordered new ones and simply sledged the originals off, but I didn't so I had to GENTLY beat them off. Stuck a sliver of antisieze on the edges before reinstalling so it won't be so bad getting them of the next time around. Getting the carrier back into position was a pain too. Might have been easier if the jeep was on a lift, but on your tummy under the jeep with jack stands..... the carrier gets heavy pretty fast!


Funny... there was nothing really wrong with the seals other than a bunch of gear dust gunk. That's why there was leakage. It should be a standard note to change the diff oil after a break in period on new vehicles. It seems to me if the gear dust was cleared out directly after the gears are broken in, we would see MUCH fewer seal leaking issues. That and the fact the factory SERIOUSLY overfilled my front diff.


Anyway... good axles and I'm glad I spent the money.



Gotta change toe oil in my rear diff next weekend!
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Old 09-10-2019, 10:26 PM   #17
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Love my RCVs on the old Jeep. New Jeep will be getting them when the ujoints go.
Did you replace the axle seals with the Mopar 2 piece seals or aftermarket seals?


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Old 09-11-2019, 06:39 AM
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Love my RCVs on the old Jeep. New Jeep will be getting them when the ujoints go.
Did you replace the axle seals with the Mopar 2 piece seals or aftermarket seals?


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Yeah... I used the 2 piece mopar. Went in pretty easy
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Old 09-11-2019, 08:14 AM   #19
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Awesome upgrade!
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Old 09-11-2019, 08:16 AM   #20
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Are your rcvs slinging grease like crazy? Mine have from day one, but i do a lot of highway miles.
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Old 09-11-2019, 11:44 AM   #21
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Mine don't. Have you got the boots on fully?
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Old 09-11-2019, 12:32 PM   #22
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Mine are fairly new, but no grease slinging yet. And we also do a fair amount of highway driving as most everything is a ways from here.
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Old 09-11-2019, 01:21 PM
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I think the mistake there is too much grease. Of course they supply you with the grease (one tube) but I think I used maybe 3/4 of the tube on both axles. I let it suck in as much as it would take then pretty much leveled it off.... we'll see though. So far no slinging.
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Old 09-11-2019, 02:18 PM   #24
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Im sure they are on fully. I even used the ziptie trick to get them seated. They were full of grease when i got them in the mail as well. I'll have to try cleaning them up and see if they still are slinging grease.
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Old 09-11-2019, 10:22 PM   #25
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I put 90,000klm on those RCVs when I traded that Jeep in and never had a problem with them slinging grease.


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Old 09-12-2019, 12:00 AM   #26
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Are your rcvs slinging grease like crazy? Mine have from day one, but i do a lot of highway miles.
I just got mine a few weeks ago. The have been slinging a bit of grease.
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Old 09-20-2019, 11:08 PM   #27
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Mine slings the grease a little as well. It's not that bad though.
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Old 09-20-2019, 11:17 PM
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Mine slings the grease a little as well. It's not that bad though.

Yeah, I just check mine which have now been in about 10 days. They're slinging a bit.

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