I had the same issue, and it was driving me crazy for months. I found a lower control arm bolt was way under spec for torque. I tightened it up a few weeks ago and haven't heard it since. I had a similar issue before and it was a loose sway bar link. I'm now going to start checking the torque on...
Go back through and check that everything is torqued to spec. I had a knocking noise I couldn't find for months. I kept looking for something loose but everything seemed tight. It wasn't until I recently went back through with a torque wrench double checking all the bolts and I found one that...
I have this issue if I off-road a lot, I just tighten up the sway bar links and the sound goes away. I've learned to just to check and tighten them up every few months now.