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Heim joints are a metal to metal connection. JJ have polyurethane in the joint. This means JJ work as vibration isolators where the heim joints do not. So, in a control arm situation of a road rig you need some form of vibration isolation, in a trail only rig it does not matter.

If you have heim joint the other end needs to be rubber or poly. With a JJ you can have both end JJ and still have decent on road feel. You add in the fact JJ are rebuildable well...
 

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What about RKs krawler joints? How do they stack up compared to Johnny and heim's?
 

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x2 on RKs new-gen Krawler joints. They are the sweetness.

The MetalCloak stuff is looking good these days too.....

JJs are good stuff but they are a gold ignot wrapped in a banana leaf. What I'm trying to say is the joint itself is fine but you'll never come close to getting full misalignment out of them before the housing contacts the mounting bracket and you're finished getting flex outta them (at least on the JK). They are kind of a half-baked design. Then they fatigue the mounting brackets or flex has to come from somewhere else in the suspension. They like to work your jam nuts loose.

I have pictures of nice polished rings on the inner surfaces of my mounting brackets and matching ones on JJ ends, because they were constantly meeting well before full misalignment is reached.
 

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x2 on RKs new-gen Krawler joints. They are the sweetness.

The MetalCloak stuff is looking good these days too.....

JJs are good stuff but they are a gold ignot wrapped in a banana leaf. What I'm trying to say is the joint itself is fine but you'll never come close to getting full misalignment out of them before the housing contacts the mounting bracket and you're finished getting flex outta them (at least on the JK). They are kind of a half-baked design. Then they fatigue the mounting brackets or flex has to come from somewhere else in the suspension. They like to work your jam nuts loose.

I have pictures of nice polished rings on the inner surfaces of my mounting brackets and matching ones on JJ ends, because they were constantly meeting well before full misalignment is reached.
Can you explain the importance of misalignment to me?
 

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Can you explain the importance of misalignment to me?
I don't think you want to take advice from a guy that has called the best joint option on the market a "half-baked design".

The stock JK has rubber bushings on both ends of the control arms. With the limited amount of factory suspension articulation (travel) this works fine. Once you make changes to the suspension to allow more travel then the flex range of the control arm end is maxed out this causes pressure on the brackets, control arm end, and bolt. Stock brackets are thin and only lightly welded onto the axle housing, they are easily ripped off. Brackets have been a problem from day one with linked coil spring suspensions. A joint that pivots allows for more movement or "misalignment". There are seveal designs currently on the market.

The real beauty of the JJ design is you can use them on both ends of the control arm so in effect you get twice the amount of control arm movement or "misalignment". Of course, opinions vary as always. I explained my reasoning a few post above in this thread.
 

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If you do have any questions about our new Monster Krawler Joints let us know! The new ones are a rebuildable sealed unit that comes pre greased from us and are pretty much maintenance free. They offer a full 40 degrees of misalignment.

RK
 

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Be aware... Johnny Joints aren't all that rebuild able. If that factors into your decision one bit, remove it as a plus.
 

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I plan on running the johnny joints from Jeep Speed Shop (JSS) seem like a pretty well made joint for a good price.
 

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I don't think you want to take advice from a guy that has called the best joint option on the market a "half-baked design".
And I, conversely, don't think you want to take advice from a guy who voluntarily overlooks an obvious mechanical interference issue which reduces joint performance and increases mounting point stresses, just so he can call them the 'best joint option on the market'.

But hey, each has our own opinion and its your money. Good luck whichever direction you go. :beer:
 

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Our Krawler Joints are certainly pretty sweet! They offer a total of 40 degrees of misalignment, they are easy to be rebuilt with normal hand tools! They are a nice compromise between a JJ and a Heim Joint! They are tighter than a JJ with more misalignment, but they are smoother than a Heim Joint!

RK
 

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The RK joints are pretty sweet. They're tight and pretty much maintenance free, shoot some WD40 in it every now and again and roll on. The Johnny Joints are a decent joint but everything has its limits. I by no means think they are the best joint option on the market and I've almost used them all. Summit Machine seems to have that pretty nailed down and so does FK on the rod end side. The Johnny joints aren't bad but like stated above they do have a contact problems. A bushing at one end and a RK Joint would net the same amount of misalignment if not more than a JJ setup with less maintenance. Just something to think about.
 
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