When it was jacked up..did anyone check for ball joints, tie rods or wheel bearings?

well i didnt....and my dad obviously didnt so no

my guess is the wheels are out of balance or not balanced , take your wheels to walmart they can check and balance them for cheap i think if i recall correctly it was like $12.50 a wheel, also look at your wheel see if any weights are missing if u know there was wheel weights there from before and there not there now this is probably the problem

i would say wheel balance, and struts, because my car used to shake a bit around 100 with bad shocks, now it feels smoother around 80-105 than it does goin 25!

Disclaimer:I go that fast because im dumb, don't go that fast.

i used to hit up 100 down my favorite country road every day to school but now i dont cuz of gas