I heard a pop (while wifey was turning the wheel) after installing our new Currie track bar, and i think it was caused by 1) an enlarged axle track bar bolt hole (axle side) and 2) re-using the factory bolt. I think the insufficient pre-load of the re-used factory bolt and enlarged axle bracket hole made the track bar bushing move relative to the axle when under load, hence the pop. Maybe a possibility... ? The track bar resists steering forces..
To address it I installed a grade 8 7/16-20x3" long bolt (had to drill out track bar bushing). I didnt have to drill out the axle hole since it was already enlarged, presumably from moving around too much prior to my ownership.