stock control arm strength? - JeepForum.com
 
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post #1 of 13 Old 09-13-2012, 09:32 AM Thread Starter
ssands85
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stock control arm strength?

I just got all four new stock control arms and the uppers seem a little thin to my liking.... was thinking about finding some similar gauge sheet metal and boxing them in. To add some strength.
Also is there a bushing for the rear of the upper Control arm? The arms already have bushings in them but the uppers only have the front bushing. Just wondering if i need to get that before i'm without wheels tomorrow....

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post #2 of 13 Old 09-13-2012, 09:47 AM
errorcode3
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I plan on boxing them in for an autocross jeep i'm building up over the winter.
And those arms are pretty sketchy looking on the "strength", granted i'm not an engineer, (i pretend to be at my day job) but someone must have decided they work. ( i do know that when they fail you will go tits over tea-kettle, at least my buddy did a couple years ago).

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post #3 of 13 Old 09-13-2012, 10:53 AM Thread Starter
ssands85
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Yeah its just a little worrysome that something that important on the steer axle is weak enough to flex with your bare hands.... I suppose ill have to dig through the scrap steel and see what i got...... Somehow i always seem to find the weak links in drivetrains And suspensions...
An autocross jeep? Id be interested in seeing a little more about what your doing there. Got a thread on that?
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post #4 of 13 Old 09-13-2012, 11:04 AM
JohnnyZJ
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they are designed like that (at least i think) so they will crumple in bad collissions, and either not twist the frame or rip the mounts right off.

box em in, sure. would have been easier to just get aftermarket arms if strength is your issue.

07' JKUR rollin on 35s
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post #5 of 13 Old 09-13-2012, 11:10 AM
errorcode3
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Quote:
Originally Posted by ssands85 View Post
Yeah its just a little worrysome that something that important on the steer axle is weak enough to flex with your bare hands.... I suppose ill have to dig through the scrap steel and see what i got...... Somehow i always seem to find the weak links in drivetrains And suspensions...
An autocross jeep? Id be interested in seeing a little more about what your doing there. Got a thread on that?
No thread, trying to keep it hush, hush and half these guys seeing what i'm about to do to a jeep..
like this..
first part is just cars, but you can watch it i think they have the truck class.
this is where we figured out the control arm will flip you over (not this vid, but this style of event)

98 - Slate 5.niner. minor mods
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post #6 of 13 Old 09-13-2012, 11:16 AM Thread Starter
ssands85
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Well I would love to...someday maybe. Right now the budget is kinda getting in the way. The fiance seems to think that every spare dollar I make should go toward a wedding that is just over a year off. Our opinions differ on that point, but then again I'm terrible with money.
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post #7 of 13 Old 09-13-2012, 11:19 AM
StellaTheZJ
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The stock control arms are indeed designed to twist. They are strong under compression or tension, but under torsion, they twist quite a bit when crossed up. This reduces the stress on the mounts and the bushings at either end.
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post #8 of 13 Old 09-13-2012, 12:32 PM
jr4x4
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the other bushing for the top control arm is mounted to the axle on both sides
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post #9 of 13 Old 09-13-2012, 12:47 PM Thread Starter
ssands85
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@ errorcode3 ;That looks pretty cool. Didn't get to watch the whole video cuz I'm at work....but I'll get to it later tonight
@ Stella ; I hadn't thought about the extra stress on the bushings with stiffer arms... food for thought.

When I get home tonight I'm gonna do the lowers at least..... I'll have to take a look at what was in there stock and compare the uppers though.
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post #10 of 13 Old 09-13-2012, 02:15 PM
PolkaPower
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They are pretty strong as long as you don't drag rocks with them. They kind of bend when that happens.
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post #11 of 13 Old 09-15-2012, 05:51 PM Thread Starter
ssands85
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Holy crap! What a difference that made. Can't wait to see what new springs and shocks do....
For anyone thinking about new control arm bushings. Do it!
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post #12 of 13 Old 09-15-2012, 06:35 PM
PolkaPower
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Like a new ZJ again!
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post #13 of 13 Old 09-15-2012, 07:12 PM Thread Starter
ssands85
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Now the question is save for tires or save for the OME 1" lift springs and new shocks next?...

Oh my goodness though. I had to drive my dads 97 ūton dodge reg cab long box to work last night... what a battle that that was to keep on the road..... I thought my jeep was bad enough with bad bushings but holy crap. That thing rides like a brick with solid tires..... Ive been in skid loaders that rode more smoothley than that pickup. Driving my zj was like riding in a cadillac compared to that beast.
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