So I too have had the noisy backside I have taken silicone spray liberially to the bushings, yes some say a temporary fix at best, but at least you'll know if this is the cause of your noise. The eventual thing I found that made my nusiance "creeky" noise, a couple of pieces of gravel on the lower control arm lodged next to/under the rear shocks and the lower control arm . Had to dig at them to get them out, but that cured my noise.