Setting Your Caster
If you’ve just installed a 2" lift or taller on your Jeep JL Wrangler, your caster will have changed enough to cause some people to feel a "flighty" or "wandering" sensation when driving at highway speeds. To address this problem, you will need to add more positive caster on your front axle and so that it sits closer to stock again, which is +4°. Of course, being that the JL utilizes an FAD (front axle disconnect) system, even more positive caster can be added and without ill effect. Bringing your caster to about +6° or so will help make your JL's steering feel even tighter.
The best way to set your caster is to install a set of adjustable front upper and lower control arms. The lowers should be used to reposition your axle under your Jeep and the uppers used to set your caster. If you're on a budget, you can get by with just a set of adjustable front lower arms but, you will need to make sure they can be set long enough to give you what you need. Both methods are covered in this write-up. While cam bolts can be used as a cheap solution to add a bit more positive caster, I would not recommend them.