Re: Looking for GC
on zj an wj. the track bar. the holes get reamed out. the metal bushing can pop in and out slightly where the bushing mounts to the body bracket and to the axle. since you have the body noise, i'd look closely to the body side. also, while under the vehicle. in park of course with e brake on. have somebody turn fully left and fully right. look fore movement or flex on the mount plate and where the bushing mounts to the plate. you probably wont get the pop, but the track bar takes a lot of stress and needs to stay rigid. track bar is what keeps the axle on center while jeep turns. if you see flex/movement, you may want to take it apart and look/measure hole/bushing. look for broken welds on the mounting plate. look closely. if memory serves, zj is a bolt on, wj is a weld on. sometimes the failure is where the plate mounts to the body rail.
it doesn't take much failure to make a loud noise. i am suprised you have no evidence of death wobble. however, the dampener will take the mild shimmy out. until it fails then you get the true affect of the DW from track bar wiggle.
hope this helps. let me know.