Check at rear lower control arms. Had the same issue years back. Took me quite awhile to figure out it was coming from rear, cause it sounds and feels like front. If lowered, the panhard bar pushes axle over. And when u hit a bump, especially at angle. It will make a popping noise from binding up at front mounting bracket. Could be wrong, but happens with these lowered rigs. Have someone next to your ride and listen while you try and duplicate the noise.
But could be number of things, just gotta figure out if front or rear first.