[Doug1227]

Just for clarification, we tightened the panhard connecting bolts first and that didn't make it stop. It was the lock nut on the passenger side. It was hard to get a wrench on and I think I erred by thinking I could tighten up the driver's side and it would push it tight on the other side. Since both sides are threaded, they both had to be tight. We dropped the bar, tightened the passenger side lock nut, put it back together and for good measure tightened the driver's side lock nut as well and it's quiet now. Even if the sound comes back, I'm happy that I at least know what it is now and how to fix it. I know I'm making a big deal out of this, but it's been rattling for MONTHS! I'm pretty relieved to have figured it out.