[Super73]

The triangulation on the wish bone (3 points) does not allow for shift. You have to also consider the effects the 4-link bars have on it. This is a sytem. Yes the balls in the heirs are free to rotate and spin but, you would have to bend the bars in order to get rear end shift. If the 4-link (or even 3-link) left/right bars were not there the rear would rotate based on the single link end. But it can't because those bars are keeping the wheelbase the same.

If the rear were to move to the passenger side keeping wheel base the same, the right wishbone link would have to get longer while the left would get shorter.