Both. Since I replaced stock (they looked a little cracked) for Autozone ones, I feel like the front is loose, and when I take regular road bumps at 60 or so I get this vibration. The hall front end is new and every single part,(tie rods etc) are really tight with NO play at all, but I noticed that the new arms,,,,, the metal is slightly thinner and the robber is not as hard as stock. I was thinking about getting JKS or something similar, but they are expensive. I only have like an inch or so lift since I put new variable rate coil springs, which gives me that little lift, what do you think?