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Unread 12-14-2006, 05:10 PM   #1
BigwillXJ
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lifted jeep alignment

My dad was recently tapped in the drivers side rear on the highway. His jeep has no marks at all but the wheel took a beating. So he got it aligned and put the bad wheel in the back and got a horrible vibration. So yesterday we got the wheel replaced and everything balanced and we still get the horrible vibration about 50 mph. My ? is there any different secification for alignments for a lifted xj?

The jeep is an 87 with RE 3.5" superflex with non adjustable lowers.

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Unread 12-14-2006, 08:21 PM   #2
Arcticcat843
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Quote:
Originally Posted by BigwillXJ
My dad was recently tapped in the drivers side rear on the highway. His jeep has no marks at all but the wheel took a beating. So he got it aligned and put the bad wheel in the back and got a horrible vibration. So yesterday we got the wheel replaced and everything balanced and we still get the horrible vibration about 50 mph. My ? is there any different secification for alignments for a lifted xj?

The jeep is an 87 with RE 3.5" superflex with non adjustable lowers.
Well i would say No just becuase i know they used the stock spec to align my jeep. But i guess it could be wrong on mine to, but i dont have any bad vibrations.
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Unread 12-15-2006, 12:16 AM   #3
XJING
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Speed related wobble is 99% of the time related to balance of the wheel and TIRE, sometimes the tire will slip a belt, or if it did get hit in the accident maybe the belts are bent. Try putting the spare on the tire that got hit and see if it makes a difference. Good Luck
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Yes, probably, I dont know. I could but sometimes it was difficult. Just get under there and try.
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Unread 12-15-2006, 12:19 AM   #4
mud-dog27
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when it comes to jeeps and alignments its pretty much usless cause all you can really do is adjust the toe....i had mine done when i lefted but like 2weeks later it was outta whack again pretty much just check everything that could have been damaged in the front end...and go from there
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Unread 12-15-2006, 06:35 AM   #5
XJING
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Quote:
Originally Posted by mud-dog27
when it comes to jeeps and alignments its pretty much usless cause all you can really do is adjust the toe....i had mine done when i lefted but like 2weeks later it was outta whack again pretty much just check everything that could have been damaged in the front end...and go from there
I guess thats why they make adjustable Track bars and adjustable upper and lower control arms. (So you can adjust for castor too)
I have adjusted my castor at 2" lift hight with shims in the control arms and an Adjustable Track bar to bring the axle dead center. Never have a problem with alignment,
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Originally Posted by FleXJ the Kid
Yes, probably, I dont know. I could but sometimes it was difficult. Just get under there and try.
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Unread 12-15-2006, 09:14 AM   #6
Jason, aka: Jeepin.com
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Quote:
Originally Posted by mud-dog27
when it comes to jeeps and alignments its pretty much usless cause all you can really do is adjust the toe...
why do people think this? caster is completely adjustable on XJ's, regardless of if you're lifted, or stock, or have adjustable arms or not. The only thing not adjustable on an XJ in stock form is camber. And even that can be adjusted if you get eccentric balljoints.

edit: it's quite possible that the axle got bend, or something else was damaged when your dad's XJ got hit that is causing the vibration.
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Unread 12-16-2006, 04:10 PM   #7
anony91xj
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As usual...start with the basics. Rotate the tires front-to-back and see if the vibration moves to the front. If it does, that tire is the culprit. Even if it's balanced on a balancing machine, that doesn't mean that the belts haven't slipped or that it's worn evenly. Check it out closely, you'll probably have to replace it if the vibration changes with the tire rotation. Check the other 3 tires closely while you're at it.

If the vibration doesn't change, look at the rear axle and driveline. It is possible that the axle shaft got bent in the accident. Is one axle seal leaking badly? That could be a sign of a bent shaft. If this is your issue, I'd recommend heading to the junkyard for a complete rear instead of just replacing the shaft and hoping that'll fix your issue.

Neither of these issues are alignment related, but they are the most likely causes for your vibration.
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Unread 12-17-2006, 07:53 AM   #8
balloo93
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Just to clarify, the caster adjustment is made via the lower control arm mount. If you look at it, there is a U shaped bracket inside the mount itself. There is a bolt that is attached to that and it goes through the rear of the mount and bolts down.

You adjust the caster by adding shims between the Bracket and the back of the mount and that will push the LCA forward or allow it to be moved back.
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