S30 Rear Strut Assembly Knocking
New member here, I just recently picked up a 78 280Z as a first car for my brother and have been working on the suspension for the last couple months. After replacing the shocks and springs on all four corners with kyb's and voigtland springs, along with new end-link bushings, tie rods, and a set of T3 rear lower control arms, I started getting this knocking sound coming from the rear when driving over any uneven surfaces.
First thing I did was take the whole rear suspension apart and put it back together again to make sure I hadn't left anything out when doing the initial install and the noise is still there. The rear knocks when I push down on the car's rear end repeatedly and sounds like its coming from the upper part of the assembly where the strut mounts are. To add to the symptoms, with the car off the ground I can also get the noise by grabbing the assembly and pushing it back and forth, in which the entire assembly will wobble with enough force. That the assembly can wobble that much worries me but I'm not sure if that's normal or not because the only cars I've ever worked on had leaf springs in the rear.
Any input would be hugely appreciated because this is starting to stress me out....