How strong is it, can you feel it? Do you notice it at all speeds or just going slower? I recently just lifted as well and I'm also trying to tackle to new noises one by one myself. I have a pretty decent pop/clunk from my sway bar, it's more so when the body begins to roll (thus working the bar), but I have noticed it over some sharp bumps, but if your noise was pre-existing to the lift it probably wouldn't be the sway bar (if it feels like its RIGHT under your driver's seat, it might be). I also have an annoying squeak that I suspect to be the drivers UBJ or LBJ, which could be your culprit.
It's more than likely a bushing, but could also be a ball joint. Check any of the bushings to see if the holes have been stretched or egged out, even a little bit, and check your BJs and see if they're wet. Does it sound like a rubber or metal clunk? (maybe take a video if you don't know). The thing is they dont necessarily have to appear broken or look different at all for parts to fail - as they age they tend to wear in a specific fashion, and when you begin to mess with the lift you're now causing parts to work and wear at a totally different angle than before, and this can really expedite their need for replacing. This goes for pretty much everything on a car - from the U-Joint bearings to the control arms to the rubber bushings holding everything together.
If you haven't done your ball joints/control arms I'd seriously look into it, but first check out the bushings. If it doesn't go away, at least you know you're not potentially risking a crash and have fresh components. What lift did you go with anyways?