I just replaced my driver side ball joint cause mine was "going up and down" too. Also had my tie rods replaced and a new balance and alignment (which was the original reason I took it to my friend's shop while I was back home). Noticed i was getting alot more of that popping when turning the steering wheel. Now she steers real nice and tight and the ball joint's not "going up and down anymore" without the UCA attached firmly. Looks like your's lasted a tad longer than mine. i'm at 76k.