Whenever I drive my Jeep at highway speeds it tends to steer itself or randomly pull one way. It's almost as if someone was grabbing the steering wheel and pulling it. Typically its towards the passenger side.

My question is will new adjustable front lower control arms take care of this problem and if so is there a certain degree that the front pinion should be at or do I just do a "trial and error"?

Thanks

 

before you go replacing stuff i'd check to make sure that your steering components are all tight and secure. have you checked with your dealer? maybe a last option for some people,

 

Well I just installed new gears about 2 weeks ago and I made it a point to go through the entire Jeep and make sure everything is torqued down like it is supposed to be. When I did all of this I still found nothing obvious and after driving it since the work has been done it still has this pulling/wandering issue.

 

i think the c/a's will help you in relation to getting your castor back closer to spec. i have the
4" TF springs on mine and i set the front lowers close to 23 1/4" to get the castor just less than 5 degrees. it's trial and error to get it right with each individual jeep/ mods and not get vibes in the front d/s. but,,, i couldn't tell by your post if it drove fine before the gear install and suddenly afterwards, it started driving like that???

 

The RC 4" kit comes with CAM Bolts. Were they installed? If so, take it back to whoever did your alignment and have them adjust your caster.

If they were 'not' installed for whatever reason, then you should consider a set of adjustable arms.

If Cams were installed, and you choose to go to adjustables anyway, you'll need to get the holes that were cut out for the cams welded back up before you can install the new arms. (though you could leave the cams and install the adj arms also, but don't really know why anyone would choose to do that...)


You should also browse through the FAQ's at the top of this modified area. Here is one section in particular to look at:

It also wouldn't hurt to familiarize yourself with this one:

http://project-jk.com/jeep-jk-write-...-end-alignment

-note that the +6°~8° of caster mentioned above is from an angle finder you place under the axle C's. It may not directly relate to the measurements given on a professional alignment machine.


And here is a member write-up for that kit. Note steps 11-13.

http://project-jk.com/jeep-jk-write-...ation-write-up

 

As others have commented this could be other things, but random wandering is a classic symptom of incorrect caster angle, since the fore-aft inclination of the virtual king pin is what makes a vehicle track straight.

The problem on a lifted JK is that too much caster will at some point cause the front axle to start binding slightly (excess front pinion angle). Most threads I've read recommend ~6 degrees positive. The adjustable LCAs should help if the problem is caused by a slipping cam bolt or the cam bolt can not generate enough caster angle.

I just bought a lift kit that comes with cam bolts and I also a got a set of LCAs so I can avoid using the cam bolts. Just for good measure.

 

Adjusting castor will help. But you have to remember with big meaty tires ,crowned roads are more noticeable. You can also check out your camber also.