timamybrown

So I got a alignment on the xj after I installed the lift at firestone.
I just put my new 33in bfgs on about 500 miles ago and the driver side front is starting to cup on the inside. I checked ball joints and the xj got new front hubs before the lift the tre are all good. So I got to looking around and there is no way they could have adjusted my caster because they never even touched the bolt on the adjuster behind the lca. Could this be the issue?

hbracing13

Did they show you a print out or anything? Most of the time is a toe and go. On the newer axles the caster adjustment is on the lower control arm mounts with a cam on both ends if I remember right. If you had adjustable arms they won't touch them, unless it easy to adjust meaning, no taking off a bolt and either longer or shorter. Same with tracbar they set it to factory specs. Unless they know how to manually enter height It will always be set to stock.

timamybrown

They did give me a print out.
lf camber -.04
rf camber 0.3
lf caster 5.1
rf caster 5.1
lf toe 0.01
rf toe 0.01
Does this look right. Just cant figure out why the left front tire would start to cup so fast.

Bustedback

Caster is not a tire wearing alignment angle. You have negative camber on the left front. Toe and camber are the only tire wearing angles.

hbracing13

Its your camber that's not right a whole degree off on the left goin on the inside I think. Spec is -0.5 to 0.5 on camber. It could be as easy as a hub bearing starting to go. Even ball joints.

timamybrown

Would that little bit of negative camber cup a tire that fast? -0.4 is still in spec according to my print out. If there something I can do about I would like to fix it, don't want to be messing up a brand new set of tires.

Turbo X_J

Bad shock or tire balance maybe even a junk tire.

hbracing13

Shock is what really popped into my head I over think the basics sometimes.

Fred/N0AZZ

Both of you guys are right on shocks IMHO (the best you can afford). And tires you can get bad ones even though they are new won't balance, other defect's and the more meat they have on them makes it harder to balance a lot of the time. My last tire purchase for the XJ out of the 5 they returned one before it was ever installed because of all the weight it required to balance it, almost a pound

timamybrown

Thanks guys ill see if I can get the tire rebalanced. And check my front shock.
I put about 1500 miles on the old 235s after the lift and they didn't cup at all so im guessing its the tire.

timamybrown

Not sure if this makes any difference running down the highway the xj tracks nice and straight but in town if the road is a little off camber it wants to pull to the right.

93gc40

through the printout in the trash.. Go get your self a tape measure and follow these directions. 30minutes and zero cost problems solved, http://www.go.jeep-xj.info/HowtoAlignment.htm

93gc40

Remember that most alignment shops use an alignment computer.. Both the tech and the computer only know how to adjust to the FACTORY spec. That spec is based on a 215/75-15 tire and NO lift. A lifted Jeep with oversized tires requires an different spec, that is not listed on the spec sheets or in the computer.

93gc40

to help with the problem of drift down off the road crown. You can adjust the right wheel base to be a bit longer than the left. If I recall the factory setting is about a 10mm difference.

Bustedback

We'll you have positive camber on the right and negative camber on the left, by those angles it should pull to the right, then you throw in some road crown to the mix. The vehicle will pull to the side with the most positive camber. Negative caster will cause a pull to the side with the least amount of caster.