Death Wobble, Can't go over 45mph.

[95meangreen]

alignment- check your toe in and toe out and adjust your tierod accordingly make sure tires are balanced. steering stabilizer just bandaids the problem not fix it

 

[gung_ho_xj]

I just had it aligned. It made the wobble start at a lower speed. And the tires are balanced.

 

[Harlee&Tahoe]

axle mount may now be wallowed out, sounds like it's time to weld a plate over the old hole and re-drill

 

[WarnFleXJ]

I have an 2000 xj with about 100,000 on it and have had an 9'' lift on it for about 45,000. I also had a severe case of DW. I found that the CASTER ANGLE of the front axle was out of spec. From doing much research with many distributers, such as R.E, Rusty's, O.M.E., and Nth Degree they have said that the caster angle should be set back as far possible, meaning closests to the T-Case as possible. I did this and thought if cure the DW it did to an extent, later i found that my upper C.A. bushing were slighty worn. And yes this is a daily driver/wheeler

 

[gung_ho_xj]

I got a new, bigger, bolt in the axle end of the track bar. That seemed to fix the track bar moving around. It still wobbles though. I also put a new steering stabilizer on, that didn't help. I'm thinking it's either ball joints, or control arms.

 

[jelrod]

Check to make sure your ball joints are tight. I checked mine and was able to tighten 3 of them a 1/4 turn and the pass. lower 2 FULL TURNS!!! This has fixed my wobble about 95%.

 

[UNCC_99XJ]

Using the search feature I stumbled upon this thread.....

Just installed a 3" BB yesterday (coil spacers, shackles, and blocks). Also installed were new BDS shocks, and a JKS Adj. trac bar. I eyeballed the alignment of the caster, and am taking it to Merchants tomorrow to have it aligned properly. I have a tcase drop that is going in as soon as I can get those damn studs broke lose.

Now the problem, MAJOR death wobble that starts at 45. I am unsure as to if it goes away at higher speeds, because i'm afraid to take it up to a higher speed. Just did a 55 mile HIGHWAY drive at <45mph in the slow lane (not fun at all!). I know for a fact that my stabilizer is shot, and I am replacing it ASAP, and yes I alreay know that just masks the problem. But i'm hoping an alignment will solve (if not completely cure) this issue. I did some of the other tests mentioned about checking the rest of the front end, and everything seems to be nice and tight with no play.

While i'm at it tomorrow I might swing by and get my tires rotated and balanced again. I'm really trying to avoid having to start replacing everything on the front end. The jeep only has 95K on it.

Comments and suggestions welcome. And NO, i'm not eliminating the stabilizer.....just can't justify eliminating something from the steering...especially when it has had one from the factory, and was designed to have one.

 

[Sierra Drifter]

Ok, so recently my track bar end broke and I replaced it. Well, before it broke my xj wobbled, but after about 55mph it would pull out of it. Now it doesn't come out of it. I can barely go over 40mph without it wobbling. Any ideas? My steering box is leaking and makes creaking noises...but I really don't have the $300 to replace it. It could be my ball joints also. But I'm not really sure. It has 146k on it. I replaced the wheel bearing about 1k miles ago so I know they aren't the culprit. Any help is greatly appreciated.

You said you replaced the track bar, and latter the bolt.
Track bar issues are the number one cause of DW. Make sure the axle side mounting bolt hole has not worn out into a large hole. If it has, and you have an adjustable track bar, you can drill a new hole and inch over to the right. Also if you mounting bolt is just a little too long it will hit the axle tube and never really get tight. Dont throw away your stabilizer. Beyond that read through this:

Some useful information concerning curing death wobble from Kevin at KevinsOffroad.com Maybe it will help you.

As you have already found out, Death Wobble, the horrible front end vibration that starts when one wheel (usually the right) hits a bump around 40~50mph, is the worst possible downside to having a coil-sprung vehicle with a track bar setup such as the WJ, XJ, ZJ, and TJ use. Death Wobble is also extremely difficult to try to diagnose, because it is actually caused by slop in the entire steering system as a whole, not by one component. To diagnose correctly, one needs to look for "play" everywhere there is something that could have "play" in it. It's time consuming, and downright dangerous while you are in "test phase", trying to exorcise this demon from your Jeep.

The thing I tell people to start with is a visual inspection. Spend 10 minutes under the front end and visually inspect each one of the steering components for shiny steel, which would be indicative of metal that's moving around when it's not supposed to be. Pay careful attention to the track bar, as it's usually the culprit in most cases. If any of your bolts are even the least bit loose, Death Wobble can manifest itself and make your life a living hell.

If everything looks to be "normal" and you've checked bolt tightness on the track bar, the next thing to do is to start with an alignment, making sure that caster is set correctly as well as toe-in. If you have been offroading and have bent your tie rod even slightly, it'll throw off the alignment. Plus, it's only $40 or so.

If you are certain that it's set correctly and you've not replaced any other front end components recently that may have caused the oscillation to begin, I tell people the next most suspect thing is the factory front track bar. Over time, the tie rod end on the upper portion of the bar develops "play" in it, and the lower end has a rubber isolator bushing in it that allows the oscillation to occur. Aftermarket bars generally come with urethane bushings that allow much less "play" in the way of movement than the factory rubber bushings do. The problem with most aftermarket track bars for the Jeep is that they also come with either a heim joint, Johnny joint, or tie rod end on the upper end of the bar, which works fine for a while, but wears out over time, leaving you right back where you started, with a mess in your shorts, a temporarily deaf right ear from the wife screaming, and the frustration with your entire Jeep in general...NOT good. The reason why I created my Track Bar Conversion for XJs and ZJs is to eliminate that problematic (and expensive to have to replace when it wears out) joint as well as for the additional flex benefits. If you are running an XJ or ZJ with more than 3" of lift, I highly recommend you check it out. Another product we have found to work VERY well in getting rid of Death Wobble is our exclusive SuperDurometer Track Bar Bushings, which are also available for the Track Bar Conversion. They are about twice as hard as the typical polyurethane bushings that come in most aftermarket track bars, which are typically made by Daystar or Energy Suspension. They are also one of the least expensive replacement parts in the steering components, so they make sense to try first. Many aftermarket track bars as well as the stock track bar are completely ineffective in managing Death Wobble due to their "effective angle of operation" if you are above 3" of lift. Bear in mind that another alignment is necessary after replacing any front end components if Death Wobble still remains. Sometimes you get lucky and don't need one...but be wary.

The next thing to check is your steering stabilizer. I recommend replacing the stabilizer along with whatever worn components that you find under the front end, as the combination-punch is typically more effective than the parts alone, since DW shakes EVERYTHING, and loosens up other components at the same time. I've found that replacing the stabilizer alone often times doesn't eliminate death wobble directly, but that it usually helps with some additional poor handling characteristics that cause the onset of Death Wobble, such as wandering, and a new one seems to tighten up the entire steering system. I ONLY recommend the OME SD40 stabilizer because it seems to be tighter than the other models on the market. It's also the most heavy duty. This stabilizer is something that I recommend to everyone who is having trouble with DW because it's one of the least expensive parts to replace.

Here are some other components to check over for looseness or improper movement:

Tie Rod Ends, ball joints, Track bar mounting bracket bolts, steering box bolts, and track bar ends. Another product that we've made due to a need, is our ZJ Steering Box Brace, which holds the steering gear box tightly, allowing the additional stresses of running larger-than-stock tires be directed to the frame rails, rather than to the three little bolts that hold the gear to the frame, which get loose and if they do, will snap and leave you stranded. I don't currently make one for the 6cyl ZJ, but if you have an XJ, you can find one at www.barnettperformance.com.

Another source of Death Wobble is over-inflated tires (you should have around 30psi in stock tires and far less the larger your tires are. See Boyle's Law and consider how much more volume of air you have in your 33" tires compared to stock. I run around 18psi in my 37" tires).

The last thing that I can mention that has caused Death Wobble in the past is hub bearings. If there is a little slop in them over the years and miles, they MAY indeed help to cause the oscillation as well. I mentioned them last because they are the most expensive to replace and least likely to be the root of the problem. While you have the front end apart, you should consider adding some offset upper ball joints to your Jeep to return the caster back to what a stock Jeep would be if you are running say 4" of lift or more. I don't necessarily recommend this for the '93~'95 full-time 4x4 (NP249 transfer case) ZJ models, though, because it tends to add more vibration to the front drive shaft since you are also turning your pinion angle downward in conjunction with the caster angle improvement...you can't have one without the other.

Hopefully this short checklist gets you started on the right foot and helps to cure your Death Wobble.

Very Sincerely,

-=Kevin=-