on the rack (loaded) when they get the cams turned for the correct caster/camber settings then the nut(s) on the end are tightened to clamp it all together. I think you could loosen the nuts then set the car down (loaded) then retighten them but first you'd wanna make a tic mark on the cams and the frame next to them for reference to make SURE they do not rotate during this which would alter the alignment settings. and with the noise coming from the UCA does the UBJ look OK (not loose/no binding/contact as far as you can tell?) EDIT & you might see if anything metallic is loose/appears to be moving/contacting/shifting in that (UCA bushing) area that is generating the noise