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Old 09-25-2013, 09:05 AM   #1
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Front starts to shimmy when hiting bumps at high speed

Posting for my dad as I know zilch out TJs.

He just told me that he's having an issue w/ his '06 in that sometimes when he hits bumps at highway speeds, his front end starts to shimmy around. He said hitting is breaks stops it, but it appears to be getting worse.

He said this only happens when he hits decent sized bumps and doesn't happen otherwise so I'm thinking this isn't a death wobble scenario.

He was about to buy a new steering stabilizer (which could be a good idea) but I told him I'd hit the forum first to see what you guys think.

thanks

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Old 09-25-2013, 09:11 AM   #2
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Check track bar ends first, followed by tie rod/drag link ends. If you don't find something fairly obvious, do a dry steering test by having someone continue to turn the steering wheel from about the 11 to 1 position, while someone else watches and feels the steering components for any end play. A steering stabilizer would not be the root cause.

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Old 09-25-2013, 09:16 AM   #3
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That was my thought as well but he tends to not listen to me. Now, if I go back to him and say "The forum said to do X" then he'll do it.
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Old 09-25-2013, 09:26 AM   #4
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x2 on the track bar .... especially the axle side

also check all wheels and confirm no balancing weights have been thrown off, especially if he has stick on ones


if all weights appear to be present, go ahead and rotate the tires


this is all after a dry steering test has been done


also go ahead and re torque every bolt/nut on the suspension
steering stabilizers don't "fix" death wobble, they only hide causes/symptoms.........if the factory stabilizer isn't leaking, its probably fine, but it wouldn't hurt to replace it (I would wait till you fix the shimmy/wobble first), since they are cheap under $70 usually
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Old 09-25-2013, 09:29 AM   #5
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I know that stabilizers don't fix death wobble as I've read all those threads in the event it ever happens to me.

Now, correct me if I'm wrong, but I was under the assumption that death wobble's symptoms seemed to come out of nowhere and would happen frequently at higher speeds. As stated, this issue only appears to happen to my Dad when he's at higher speeds and hits rather pronounced bumps in the road. Is what is happening to him still considering death wobble?
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Old 09-25-2013, 09:43 AM   #6
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Quote:
Originally Posted by Barmanvarn View Post
I know that stabilizers don't fix death wobble as I've read all those threads in the event it ever happens to me.

Now, correct me if I'm wrong, but I was under the assumption that death wobble's symptoms seemed to come out of nowhere and would happen frequently at higher speeds. As stated, this issue only appears to happen to my Dad when he's at higher speeds and hits rather pronounced bumps in the road. Is what is happening to him still considering death wobble?
Some dw is worse than others. If he has parts just starting to fail, it could be the onset. DW is caused by side loading the tires, then when a bump is encountered (and downward weight is taken off one side), that energy is released, and if there is slop in the components, it allows the front end to resonate side to side. It becomes a harmonic thing that continues to build. As the parts get worse, the effect gets worse.
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Old 09-25-2013, 09:51 AM   #7
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Quote:
Originally Posted by Water Dog View Post
Some dw is worse than others. If he has parts just starting to fail, it could be the onset. DW is caused by side loading the tires, then when a bump is encountered (and downward weight is taken off one side), that energy is released, and if there is slop in the components, it allows the front end to resonate side to side. It becomes a harmonic thing that continues to build. As the parts get worse, the effect gets worse.
Ok, that makes sense. Thanks.

I've already researched this death wobble some time back when I was installing my lift, just in case it started happening to me. I do remember seeing a really good set of videos a guy did on diagnosing death wobble. I'll get my dad to watch the videos and we'll go from there.



Thanks guys.
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Old 11-17-2013, 10:17 PM   #8
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My YJ does the exact same thing, if I hit a bigger bump over 55mph the front end goes into death wobble mode until I slow to 50mph. Sometimes the wobbling is worse than other times. It's about a 50/50 shot that it will happen over this one bump on the freeway between my house and work. If I hit it at 75 I can usually cruise over it no problem, but going around 65 (the speed limit) I'm almost guaranteed to trigger the wobble. I am going to replace the track bar bushings soon and hopefully that will alleviate the issue, I'll let you know how that goes.
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Old 11-18-2013, 05:40 AM   #9
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My 99 did the same thing. Checked all bushings, everything seemed OK. Replaced steering stabilizer, which was shot, all was cured.
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Old 11-18-2013, 07:34 AM   #10
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Also I've read after bad components are replaced to have an alignment and if it's lifted for sure alignment can cause premature wear on those items most say a little extra caster will help also may have to get the adjustable cam bolts for the front end to be able to adjust it. When theirs not enough caster it kinda does the wobbly shopping cart wheel thing where it shakes the hole time and as parts wear wobble shows it's ugly head

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