Hey Rob. When I got my pro comp put on it made a loud pop as well. Mine only occurred when I hit a slight bump though. I took it back to 4 wheel parts to have them check it out and they double checked everything and said it was all working fine and there was no visible clues to what could be going on. So I kept driving it as is and it worked its self out. I'd say it went away after a week or so. You may also experience some noise when turned hard left or right due to rubbing depending on what size tires you are running. If anyone else has other ideas, please chime in. Hope this helps.