How many miles? Could possibly be the tie rods as well.

What's even more sad...I replaced my thrust arms a while back 03-15 to be exact w/72K, noticed one of the ball joint boots on the front lower (rear) control arms (realoem term : Wishbone, bottom,with rubber mount) were shot so I knew those needed replaced next. I actually waited until I got a more of profound clunk months later and knew they were shot.

Apparently they had already been replaced once! The arms I took off had build date code of 6/11, mine is an 08 and I bought it w/52K on the ODO in Jan 2014, so now at 80K miles it's on the 3rd set of lower (bottom-rear) arms. That's pretty shitty, or the bushings/ball joints on said part were really crappy. I replaced them w/Meyle HD like I did w/the thrust arms...