How can I tell if a lower ball joint is bad? It isn't on my gxp but on another vehicle I have. The boot is leaking and now there is a popping noise coming from my suspension when I go over curbs and RR tracks. Just wondering if this could be where the noise is coming from. The shocks and struts also have 120k on them but them seem fine to me without leaks and no strange tread wear on the tires or excessive bouncing when going over bumps.