My 15 Series Wrangler had terrible death wobble and along with some other worn components the ball joints almost completely failed. As with most steering components, I bought these cups which tightened the knuckles better than the factory ones! If you're having trouble chasing a deadly swing, START WITH BALL JOINTS! It is more than likely that there is more than one faulty component in your frontend. So be prepared to unpack and swap out everything including ball joints, wheel bearings, tie rod, linkage and tie rod, steering gear and wheel balancer.