Iron Rock Long Arm Upgrade

but doesn't it bind? When one tire droops and the other stuffs without a joint where the upper and lower meet it seems like it would bind. so then it has to flex the joint/bushing at the frame end?

I'm barely knowledgeable at how it all works so if I'm wrong teach me something.
 
98XJLimitedNateWV said:
but doesn't it bind? When one tire droops and the other stuffs without a joint where the upper and lower meet it seems like it would bind. so then it has to flex the joint/bushing at the frame end?

I'm barely knowledgeable at how it all works so if I'm wrong teach me something.
Click to expand...

There is virtually zero bind in this set up. Like mentioned before, the joints on the frame side have a high degree of misalignment, so all the rotation you need is available in those bushings!
 
93XJLI said:
there is bind, thats why you have those rubber bushings in your arms.
Click to expand...

there is zero bind in the iron rock setup.

the bushings are there to make it ride oh so smooth and quiet. and wear out and promote axle wrap.
 
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Sherman_thetank said:
x2 All suspension setups will eventually bind, no matter if you run Iron rock, or a custom 4 link.
Click to expand...

it will take more flex to bind a 3 link or wristed radius arm setup (like iron rock) than would be useful offroad.
 
ktm racer 419 said:
there is zero bind in the iron rock setup.
Click to expand...

Correct....There is virtually no binding in our front suspension setup.

Yes, we do use rubber bushings because they are a really nice feature for all of us who daily drive our XJ's with long arms. They absorb a ton of road noise and vibration before it is transmitted into the unibody.

We use high quality bushings. The non binding nature of our suspension set up does not put undue stress on the rubber bushings. As the axle swings up and down through its cycle, the flex joints in the uniframe side mounts rotate keeping the major load away from the rubber bushings. This gives the bushings a long life before needing replacement. :)
 
What I'd like to hear from are people that actually have experience with this set up. I read many "nay sayers" that likely have no first hand knowledge of this set up or this supsension in particular, only generalizations and "hear say". The people who have chimed in on this thread who have the Iron Rock Suspension say they love it. Rather than just state that "rubber bushing suck", why not give us some intellectual insight on why rubber bushing suck with factual references. Personally, I've used Poly bushings, which are the worst of the worst for a flexible Jeep suspension. I've used Johnny Joints at one end and both ends of a link and have gotten excessive wear. I've used good quality rubber bushings at one end and both ends with the great results. A rubber bushing and a Johnny "type" joint at each end has been the perfect balance of wear, flexibility and comfort for me. Correct me if I'm wrong but I believe RE, Teraflex and Full Traction all use this same rubber set up with exceptional results. As long as a good quality rubber bushing is used, I can't see a negative with this set up.
 
I helped install one of there Kits last year on my friends XJ and my first impression is that it is a very well built very beefy long arm. I am going to talk to the boss (wife) to see if i can scrounge the scratch to order the upgrade kit.
 
i helped install one of these and it looked legit. I have a TNT and i don't think the IR is as beefy, flexible, or high clearance as my TNT but the IR does very well and his XJ follows mine just about any where. I would give it a A+ for the price. way better then drop brackets!
 
Bottom line here is the system works and has been working long before IRO offered it to the masses. it is not a wristed radius since it does not have a mount that allows the arm to rotate around the axle. think of it as a radius arm 3 link. which we all know will flex with little or no bind. IRO as did RK marketed a system with 1 uca, why haven't others? i think it's a liability issue. i have seen dozens of single uca radius arm set ups in various 4 WD mags, custom built bye extremely reputable builders. i prefer a 3 link set up, but this is a nice system at a reasonable price.there will always be nay sayers that you could send a 100 pictuers and testimonals to, even let them hold it and they will still say it's crap.we are all intitled to our opinions right or wrong. i have the IRO adjustable trac bar and bracket and i have seen the RE adjustable trac bar and bracket everyone raves about and is a good product. but the IRO unit is way beefier and works extremely well and is less $. Josh i hope to see IRO on the vendors list soon, saw your post about working on it. hurry up lol we need vendors with new products and great one on one service.my.02
 
builder said:
think of it as a radius arm 3 link. which we all know will flex with little or no bind.
IRO as did RK marketed a system with 1 uca, why haven't others? i think it's a liability issue.
Click to expand...


for my own info, isn't the RK 3 link VERY different than the IRO Radius arm setup?? Just because your calling it a 'radius 3 link' doesn't make it a 3 link... if that were the case, my TNT would be a 'radius 4 link', neither of which resemble a true 3/4 link respectively.

Seeing as ford used only 2 frame mounts for their radius arm setups, I would guess the current manufacturers of radius arm setups should be ok on the liability front. Compared to 3 frame mounts on the 3 link system then liability shouldn't be much of an issue for RK, or for any manufacturer of mass produced suspensions systems, for that matter. I would think they have a bit of trust in what they are building, and have put a bit of time into research and testing to ensure liability isn't an issue on something that people trust their lives with (daily driven, or severly abused rigs either way)
 
the liability comment i made was speculation only,since there seems to be only 1 mfg of a mass produced 3 link and 1 with a radius arm set up with only 1 upper arm.point was both of the systems have very little bind so why just two.also both of the above mentioned systems use quality materials.i also used the term radius arm 3 link for lack of better description. bottom line is both systems flex a bunch and have little bind.and share the same mounting points. maybe i should have said radius arm 2 link! have a good one!
 
builder said:
the liability comment i made was speculation only,since there seems to be only 1 mfg of a mass produced 3 link and 1 with a radius arm set up with only 1 upper arm.point was both of the systems have very little bind so why just two.also both of the above mentioned systems use quality materials.i also used the term radius arm 3 link for lack of better description. bottom line is both systems flex a bunch and have little bind.and share the same mounting points. maybe i should have said radius arm 2 link! have a good one!
Click to expand...
It's not so much a liability issue. It's more of a consumer confidence issue. Many people, who do not understand how a three link or radius arm system works will shy away from a kit that goes against the factory link system and only uses three. This is scary to them and seems unsafe. You can bet your bottom dollar that we are going to start seeing manufacturers offer 4 link suspensions that give you the option to easily unbolt the 4th link, creating a three link. It is easily marketed and will gain trust amongst the uneducated suspension buyer.
 
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