I recently lifted my 2011 JK Unlimted Sport (6 Speed manaual) with a 4'' rough country Xseries lift running 35-12.50-R18, and have been battling with a vibration/Wobble ever since. I have spent hours reading through this forum, looking for someone that may have had a simmilar problem that I am having to see if I could find a solution. I found few posts that discussed the vibration dalema and tried some of the suggestions with no avail.

They seem to start at about 25MPH and come and go until about 45 then after that its all good (its the worst at about 40MPH). I dont feel it in the steering wheel at all, so I dont think it is the tires but am still going to have the balancing checked as soon as I can. I have also checked my caster and its set at about 4 degrees so that doesn't seem to bad. I know thay suggest your caster be a bit more but that will just increes the angle at the TC. Thinking that it might be the front drive shaft I took it out and went for a drive and it made no diffrence at all. I checked the Track bar for tightness and there is no way I am getting any bolt on that entire lift any tighter. I checked the to make sure the axel is centered and it is right on the money. I am running out of ideas and dont where to go next.

If this is just part of having a lifted jeep than I will just let it go but it sees very odd that I would be having this problem. I have had many other lifted vehicles and have never had vibrations this bad. If there is anyone out there that has a similar set up with any suggestions please feel free to share.

 

Here is a suggestion, go out and turn the "toe" adjustment on the tie rod out (lengthen the tie rod) one turn, and then go for a litle test drive and see what it does. I did this and my death wobble went away and everything is good to go. Worth a try anyway.

 

X2 toe is worth a shot. My JK does it but Im sure its because my ball joints are history. Yours being a 2011, its unlikely that's your issue yet. With 35s it shouldn't take long.

And if its not a front driveline vibe, wow? Good one man. Bump for you, hope someone has some more input

 

I have it toed in right now, I think it is about 1/8'' in right now. You think toeing it out is better? I will give that a try thanks for the suggestion.

 

YEah if you have 1/8" now, try one turn out and start from there. I ended up turnin it out 2 full turns with 40's and after a bash from a rock on the tie rod. Gotta play around in small increments with this stuff. ALso make sure after these bars and rods are tight, that they move at the rod ends, meaning dont have one end down and the other end up all the way. The end joints need to be able to move with the other end, it needs to be able to move. I hope you understand what I mean, if not, tell me I will explain.

 

I am not sure what bars you are talking about. I checked everything to make sure it was all tight and the control arms were all adjusted correctly. Are talking about the arm that controls the toe and the track bar that keeps the axel centered?

 

I was going to suggest toe-in as well. But seems you're looking at that. Next check the camber. And if you are running the crappy stock track bar with that lift trash it and get a stronger, adjustable one. The stock one can't handle 35's and a 4" lift. I had similar issues as you. Replaced the track bar and wha-la, no more wobble at any speeds. Jeep drives true and straight.

 

I'm talkin about the tie rod, drag link, and track bar. When you adjust any of these bars/links/rods, you make sure that the ends are at the same angles after you have tightened them. This means, for example, the tie rod, after you have tightened it all down, you can take you hand and rotate the rod itself in a rotational direction, making sure the rod is not in a bind and that it can rotate freely about 20 degrees or so. These rods/bars/links need to have some rotational free play in them, other wise they will bind and may cause steering problems and handling issues. THis is why there are rotational ball and socket type joints at the end of them for as steering and suspintion goes through its arc of movement they also need to adjust and move with the axle and steering components.

 

I did install a mutch bigger and adjustable track bar and made sure that is was adjusted properly. I am going to try and adjsut the toe out a bit and see if that fixes the problem.

 

Okay I will check the tie rod, Drag link, and track bar to ensure that they have the proper play in them to make sure that theya re not binfing up. Thanks for all the help.