Just for info I replaced the track bar on my truck earlier this year when I torqued the lower bolt I broke it loose and that allowed the bolt to loosen up and work it's way out

This happened to myself at 75mph yesterday it causes a real issue I went to turn and the front of the body moved about a foot before any tiurn happens.

If you changed your bar out check that nut out.

 

That bolt should normally have lockitite on it.