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Old 05-03-2013, 10:45 PM   #1
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One upper control arm

I read an article in jp and they said they like to get rid of one of the upper control arms (on the stock short arm setup) and it improves flex (obviously) and reduces wear on the CA bushings. Has anyone ever tried this or have any input on this? I know everyone on here is not a fan of jp but they do have a lot of experience with jeeps and this sounds like a fairly good idea. Thanks!

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Old 05-03-2013, 11:16 PM   #2
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But wich one?? I'm very interested also

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Old 05-03-2013, 11:54 PM   #3
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Yes. Its technically a 4-link front suspension but some will refer to it as a 3-link. Stock is 5-link (4 CA's and 1 track bar). A "link" is anything the attaches at the frame on one side and the axle at another and controls its movement and position. Make sense? With the setup you're referring to is used in the front and there will be 2 LCA's, 1 UCA, and 1 track bar. The CA's are triangulated. Their length, separation at frame and axle sides, height from the ground at frame and axle sides, and positioning of them on the frame controls factors that will determine how your jeep acts under acceleration, deceleration, turning, and off camber situations. The same can be done in the rear but 4 triangulated CA's are used without a track bar. And their positioning, separation, etc also control a similar set of variables. Here's a thread from a few months ago on here with some discussion about this on it. Be warned, threads like this always start pissing arguments. But this thread has some good info when you look past the pissing. And some very good links in it to build threads. And do a few google searches about this if you're interested. It's pretty cool stuff. I've been looking into it as a future mod when I'm out of college. Ha here's the link.

http://www.wranglerforum.com/f5/long...ts-228510.html
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Old 05-04-2013, 12:12 AM   #4
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Thank you for the info PStove. I understand suspension geometry fairly well. I would one day like to run a long arm 4 or 3 link triangulated but don't have the funds right now. I thought this would be a unique idea to maybe get more flex. I plan on replacing the front uppers and maybe the rear uppers with one heavy duty adjustable CA because the factory ones seem pretty wimpy.
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Old 05-04-2013, 12:19 AM   #5
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Well if you're asking about how the suspension works with only 3 CA's, then honestly, you need to do some more research about custom setups. Not trying to offend you, but before you just go swapping out control arms and playing with lengths, you need to truly understand how that will effect the physics of the suspension. Then you will begin to see that, for a suspension that truly performs well really needs to relocate the mounts on the frame and axle.
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Old 05-04-2013, 12:28 AM   #6
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I build a lot of 3 link with trackbar fronts. While I can't provide empirical evidence, common sense tells me that if you are asking one arm to do the job that used to be done by two, something has to change.

In my case, I up the joint size to be the same as the lower because I don't trust the durability or strength of that small bushing or joint size on the ends of the upper.

For the record, I've yet to see flex limited by the use of a pair of uppers in a TJ on the front. That is determined by shocks, springs, and bumpstops.
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Old 05-04-2013, 01:12 AM   #7
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I'm not trying to modify the stock link setup as far as lengths go I'm planning on keeping the stock LCAs and replacing the one UCA that I'm gonna keep with a heavier duty one just because I'm afraid the stock one is not strong enough.
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Old 05-04-2013, 01:23 AM   #8
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So let's get this straight. You want to keep your lower control arms completely stock. And you want to simply just take both stock upper control arms out and replace them with one aftermarket control arm using stock locations. Correct?

Maybe you should do a little more research than just a JP article.......
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Old 05-04-2013, 01:44 AM   #9
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Well I am asking the question for a reason, but it seams to me that one upper control arm, being of sufficient strength, would work. The axle would still be located in all directions, but would flex better.I have researched but I don't find much info specific to what I'm trying to do. If anyone has any experience with this or knows a specific reason why this could or could not work, info would be greatly appreciated.
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Old 05-04-2013, 08:32 AM   #10
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Quote:
Originally Posted by apaTJ View Post
Well I am asking the question for a reason, but it seams to me that one upper control arm, being of sufficient strength, would work. The axle would still be located in all directions, but would flex better.I have researched but I don't find much info specific to what I'm trying to do. If anyone has any experience with this or knows a specific reason why this could or could not work, info would be greatly appreciated.
It would only flex better if the arms were what is limiting flex, they aren't.
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Old 05-04-2013, 11:29 AM   #11
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Quote:
Originally Posted by Black Magic Brakes View Post

It would only flex better if the arms were what is limiting flex, they aren't.
x2

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