Rock Krawler control arm issue

just-lift-it said:

no personal experience with this setup but at a jeep show this past summer a few 2 door JK guys were running thir stuff, all of the guys i talked to who ran their parts all said they had to cut off the spring perches and move them forward and re weld them on to fix their spring bow and clearance issues becasue a regular little spring wedge most companys offer didnt cut it probably due to the fact the arms are longer... maybe this could fix your problems as well?

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hinrichs said:

ill be watching this one steve, prolly still just going to wait for the long arm, but just incase should pay attention to this and see what can be done .

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cozdude said:

So im having all 8 of my rock krawler control arms installed and we ran into a little issue. The new arms pushed my axel back about 2 inches. this is causing my coils to bow and my rear track bar to hit the coil on the passenger side. i have read around on other forums and found out that this is a common issue but could find an answer. we have tried turning the arms all the way in but they are still an inch longer than stock length. my coils will still bow but will not hit the trackbar. to get my pinion angle right tho my upper arms need to be lenghtened. this in turn bows my coils again and makes contact with the track bar.

my questions are-
1. any ideas on how to fix it

2. should i ditch the rear lower arms and just run the upper arms that way my axel isnt pushed to far back and i can still get my pinion angle right?

3.what is the proper pinion angle i thought it was the driveshaft should sit straight, but i feel like im wrong now.


Part 2-
also my front got pushed an inch forward as well. this caused my coils to bend a little as well and make sontact with my sway bars. both arms are turned in all the way and cant be adjusted in any more. im lost as to what i should do.



current lift is teraflex 2.5" (yeilds 3.25"). 2011 2 door sport.

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wayoflife said:

First off, even with 3.25" of lift, you really shouldn't need to have your lower arms set any longer than 19.75"-20". If you're going longer than that, they're being set too long and will cause contact with your track bar. Second, you have a 2-door and setting your rear upper arms for your pinion angle will bow your coils - this is totally normal. Installing wedges will help mitigate this but a better solution would be to install a set of JKS adjustable lower spring perches.

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cozdude said:

thanks Eddie i will look into getting the JKS adjustable perches then.

my lower arms are set to 20 5/8" and this is the shortest it can go. because of this should i just reinstall the factory arms?

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wayoflife said:

So you know, factory is 19-5/8" and at your shortest setting, you're looking at a full 1" longer than that - way too long. If you install a set of JKS adjustable perches, you should be able to make this work. Until then, yeah, I might reinstall your factory arms to prevent the annoying rubbing you probably have of your coils on your track bar.

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cozdude said:

damn alright. i will think about getting the spring perches but i guess i will do the factory rear lowers for the time being.

the front is pushed forward an inch as well (front upper and lowers installed) and caster is where it should be. this shouldnt cause a problem should it with it being an inch forward?

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wayoflife said:

So long as your passenger side coil isn't rubbing the bump stop tower and your driver side sway bar arm isn't hitting your coil, you should be okay up front.

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cozdude said:

the bump stop wasnt but the sway bar was. we lenghtened it and it doesnt currently. i can slide a finger inbetween on both sides at least. a lot less then i did before but it is what it is a guess. good to know i will be ok then.

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wayoflife said:

Funny how I knew that would be a problem, eh?

Where you'll need to keep an eye on these areas is when flexing on the trail. As your coil compresses, it will bow more if your spring perches aren't in line as they aren't now. For the most part, this is okay but depending on the coil you are running, it will bow more and make contact. Softer the coil, the more this is a problem.

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cozdude said:

you truely are a master of your art Eddie lol

i guess since i take the say bar links off anyway and rotate my saw bar up to get it out of the way when on the trails i will be ok as you said. im assuming my bump stops will be fine then but i will have to check when fully stuffed when on the trail.

thanks for all your help eddie!

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wayoflife said:

LOL!! Just been there done that.

Seriously, even if it does make contact, it's not really a problem - more annoying than anything as the coil catches the lip of the bump stop cup and clangs as it frees itself of it. Again, a lot of this is a problem with soft coils and I know you are running TF so you should be okay.

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cozdude said:

works for me! i can deal with that since it will not hurt anything. once again thank you for all your help Eddie

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just-lift-it said:

whats the benefit of buying adjustable coil perches vs just moving them? once its set its set? or i guess if you go to 4.5" youll want to adjust it again...

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