OP, to rule out ball joints jack the front end of the JK up and set it atop some jack stands securely. Use the jack as a back up to the jack stands for redundant safety. Then grab the front tire at 6:00 and 12:00. Yank the tire at the aforementioned positions back and forth. Repeat the process to the other side. If you have no movement with the wheel then your ball joints are fine. This is an easy way to check ball joints and will save you lots of cash IF they check out fine with no movement... instead of throwing money at parts that don't need replacing. Now if you were on 37" tires and had 80K on the odometer I would have mentioned the above ball joint check as well in my previous thread above. But I believe I read you have stock-ish sized tires and no lift if I'm not mistaken. So I didn't mention the ball joint check...