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Old 08-21-2016, 10:17 PM
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Death wobble

Can this be the cause of my death wobble?


http://youtu.be/r7X3SxBTsFI

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Old 08-21-2016, 10:56 PM   #2
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I would say it's certainly one of the causes. My opinion track bars make the biggest difference in handling in that regard. I would replace it just because it needs it even if it isn't the root cause.

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Old 08-22-2016, 10:06 AM   #3
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That bushing needs to be replaced. You might consider a grade 8 9/16s bolt kit as you work your way through the suspension.
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Old 08-22-2016, 01:14 PM   #4
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You did not say how many miles and what mods you have but not only your track bar bushing being bad you most likely you have other wear issues as well. A 9/16" bolt up grade will help some but other bushings on control arms, tie rod ends and steering joint wear, a wallowed out track bar hole on the axle end (in my case) ect. that could be sloppy causing other vibrations that are included in the DW. My jKU w/ 50k mi is nearly perfect now after addressing these issues, the only wear I can find now is in the U/L ball joints that I will address next. I have been running 34" tires on a 2.5 " lift since day one
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Old 08-22-2016, 05:33 PM
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http://youtu.be/2eQ9qaz-OPA

Replaced track bar yesterday, and had to center steering wheel, looks like the death wobble is gone, i went into the same hole that cuase the death wobble and the steering didn't even move.
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Old 08-22-2016, 05:42 PM
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Quote:
Originally Posted by fireguy View Post
You did not say how many miles and what mods you have but not only your track bar bushing being bad you most likely you have other wear issues as well. A 9/16" bolt up grade will help some but other bushings on control arms, tie rod ends and steering joint wear, a wallowed out track bar hole on the axle end (in my case) ect. that could be sloppy causing other vibrations that are included in the DW. My jKU w/ 50k mi is nearly perfect now after addressing these issues, the only wear I can find now is in the U/L ball joints that I will address next. I have been running 34" tires on a 2.5 " lift since day one
90k miles 2.5 lift with 1.5 spacers, on 34" tires. I have been running this set up 9 month ago, the only thing I was missing on this kit was the abjustable front track bar.

If I take a video to the controls arms, tie rod and drag link bushings, joint would you be able to see if they are bad?
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Old 08-22-2016, 07:01 PM   #7
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Great to hear this took care of it. Not sure it could be seen if you video it but at 90 k miles with the lift and 34" tires I am sure you have some additional wear and may need to replace some items. I have a RK 2.5 stock mod lift since my JKU was new and I just replaced my stock lower control arms on mine with some Rock Krawler adjustable lower control arms. That alone made a huge difference is the front end road feed back in the steering and tightness over the stock control arms. I got back the caster after my lift and have absolutely no vibration other than from the tire balance at 70+mph that is slight. There is an excellent thread on the forum here regarding DW. It is done by Planman so check it out and search it here or on youtube. It goes into great detail on what does and does not cause DW and how to diagnose and repair the DW issues.
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Old 08-24-2016, 12:11 PM
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Great to hear this took care of it. Not sure it could be seen if you video it but at 90 k miles with the lift and 34" tires I am sure you have some additional wear and may need to replace some items. I have a RK 2.5 stock mod lift since my JKU was new and I just replaced my stock lower control arms on mine with some Rock Krawler adjustable lower control arms. That alone made a huge difference is the front end road feed back in the steering and tightness over the stock control arms. I got back the caster after my lift and have absolutely no vibration other than from the tire balance at 70+mph that is slight. There is an excellent thread on the forum here regarding DW. It is done by Planman so check it out and search it here or on youtube. It goes into great detail on what does and does not cause DW and how to diagnose and repair the DW issues.
Thanks for the info. No more death wobble so far and the shimmy steering wheel is gone too. But I will take a look to the other components as you mentioned
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Old 08-28-2016, 12:50 PM   #9
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Just to repeat this, ad nauseum --

All, ALL DW start at the same location-- Tires.


Track bars, steering dampers etc allow it to happen. What is the condition of your tires? Are they oversize or wore unusually? Are they in balance? Fixing the track bar may stop the issue - but if the source of the problem isn't dealt with, itll just kill the new part and come back. Make damned certain that the tires are in GOOD condition, properly aired up, in good balance, not full of mud etc, and that the rims are straight and true.

While you are at it, make certain the rest of the front end is in good order.
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Old 08-29-2016, 01:55 AM   #10
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Just to repeat this, ad nauseum --

All, ALL DW start at the same location-- Tires.


Track bars, steering dampers etc allow it to happen. What is the condition of your tires? Are they oversize or wore unusually? Are they in balance? Fixing the track bar may stop the issue - but if the source of the problem isn't dealt with, itll just kill the new part and come back. Make damned certain that the tires are in GOOD condition, properly aired up, in good balance, not full of mud etc, and that the rims are straight and true.

While you are at it, make certain the rest of the front end is in good order.
Yeah, I forgot to mention tires and tire balance. You are correct, I had tires and rims load up with mud and snow to the point that i had to stop and clean them out. Tire balance can also be a cause once they wear down and they do not get rebalanced.
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Old 08-30-2016, 07:09 PM   #11
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While you are checking these items might as well fix a manufacturing flaw of the all thread bolts and get the GR8 hardware kit.

SYNERGY MANUFACTURING┬*::┬*Jeep JK┬*::┬*Synergy Jeep JK Lower Control Arm & Track Bar Hardware Kit
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Old 09-21-2016, 06:38 PM   #12
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I did the grade 8 bolt upgrade last year. If get new Rubicon next year I will do it right away
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Old 09-26-2016, 02:27 PM
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Replaced tie rod steering wheel feels better, drag link and 8 grade bolts will be next upgrade

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