Gotcha, noises are the hardest things to diagnose lol. Only thing I could think to do if you haven't tried something similar already. Is find a decent rut or hole and slowly I mean like 1-5mph dip your front and rear in it and with your head out the window listen for the pop, (i know not very scientific)repeat for the opposite side and increase speed till you hear it. Try to narrow it down to the left or right side and front or back and go from there.
*just realized you said it was lifted also-is it a full suspension lift, leveling kit or body lift. Check any spacer blocks or shims if you see any, they may be hitting or causing another suspension component to hit the frame bump stops.
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