Depending on the parts you've used, they're all suspect. I have a creaking on mine as well and In the last year I've done the lower control arms, tie rod ends, sway bar links, bushings, upper control arms, shocks, shock mounts. You name it and it's been done. All moog or TRW, and now it's creaking.These cars just hate us.
I love my V8, but I'd love it more if all 8 cylinders worked.
(they do now)
My T-bird is like George Jetson's wife, you try to give her a little money, she takes the whole wallet.