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The Importance of changing out stock track bar and lower control arm bolts

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Old 12-21-2011, 05:27 AM
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Great post. Thanks for the info. I get the issue with not using shouldered bolts, but does a tolerance of 11 thousandths (14mm vs 9/16) really make a difference? Not an engineer just asking. Seems like it would be a negligible difference in most applications.
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Old 12-21-2011, 05:47 AM
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Originally Posted by Jtrain496
Great post. Thanks for the info. I get the issue with not using shouldered bolts, but does a tolerance of 11 thousandths (14mm vs 9/16) really make a difference? Not an engineer just asking. Seems like it would be a negligible difference in most applications.
0.0114 = 114 ten thousand. This is just the BOLT size difference. So if you have 9/16 you still have to have clearance for the bolt to go through the hole. Thus the difference is increased even further. It does play a big role because the track bar bushing/sleeve can move all around on the bolt because its not right size. The sleeve is design for a9/16 bolt thus it needs a 9/16 bolt to go through it to hold it in place. Image make a circle with one hand, using your pointer finger and your thumb. Now with the other hand put your pointer finger and your middle fingers together and put them through you other hand now add your index finger and notice how it is a tighter fit but still goes through the "circle"? Its a bad example but only thing I can think of at this moment...been up for 28 hours.

Originally Posted by Gossamer
Where is everyone sourcing these new bolts?

Rick.
ace hareware/lowes/fastnel
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Old 12-21-2011, 05:47 AM
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double post
Last edited by SlowJK; 12-21-2011 at 08:51 AM.
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Old 12-21-2011, 07:25 AM
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Thanks for the info. Can't see why they would have made such a mistake. Could not have saved them any money.
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Old 12-25-2011, 06:12 AM
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So this would become an issue for a stock jeep as well?
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Old 12-25-2011, 06:55 AM
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Has anyone confirmed if this is still an issue on the 2012's?
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Old 12-25-2011, 06:58 AM
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Originally Posted by Black_JKU
Has anyone confirmed if this is still an issue on the 2012's?
Both mine and my dads are 12's

It effects ALL JK and TJ's
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Old 12-25-2011, 08:18 AM
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Originally Posted by SlowJK

UPDATE:

I did my dad's 2012' 4 door today. It has 2.5 lift, JKS front track bar, shocks and a few other goodies. He has NEVER off road his and only has 4,000 miles on his rig. His Track bar bushing DID show signs of the threads eating at the bushing sleeve. It was not as bad as mine but still noticeable. Here is a picture of the stock vs new bolts

****also its not just the track bar bolts its the lower and upper control arms bolts as well!!*****
Does anyone have the length and size of the upper and lower control are bolts? Also, are they 9/16-24 bolts grade 8? I assume the front and rear track bars use the same bolts. Great find and great research. Too bad Jeep does not fix the issue. Fed law says they have to use grade 8 on seat belts and other seat components. To bad they don't use them on other places that should have grade 8 as well. Trying to save a buck i guess.
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Old 12-25-2011, 04:13 PM
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Is there particular torque specs? or just as tight as you can?
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Old 12-25-2011, 06:34 PM
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Originally Posted by BOOST
Is there particular torque specs? or just as tight as you can?
Another fine point. Thanks. Too much x mas cheer to remember all the details i guess.
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