Vibration and clicking noise from rear end

My car use to be smooth as glass at any speed. About 4 months ago, it started to have a small, but noticeable vibration. To date, to fix this, I have had all tires replaced, the alignement checked about 3 times, strut tower brace added, bolt on subframe connectors, the transmission mount replaced. The vibration is still there. Plus, if i really get on it, it will make a clicking sound 3 or 4 times before it really catches. Never heard it before. There used to be wheel hop before I added LCA, but that noise is strange. Anyone have any pointers? I am about to replace the bushing to the Torque arm this weekend. Besides that, Im at a loss.:confused:

im going to take a wild guess and go out on a limb here.

Maybe the clicking in your rear end and the slipping and then catching could be directly linked to a failing 10 bolt:confused: