Violent steering wheel vibration

[GarmaZabi]

hey everyone, hope you all had a wonderful holiday!
I recently installed some new parts in my front end (upper control arms, center/drag link, and front sway bar links) and now whenever i hit a pot hole or uneven/chewed up pavement at highway speeds i get a violent steering wheel shake that intensifies as i speed up, if i brake heavy and slow down to about 60mph or less it stops. any ideas?

car still drives staight and the steering doesn't pull. I did not have this issue before..
arms are Lemfoerder and center link is Meyle.

[alpinacsi]

Did you tighten the bolts for the control arm bushings with the suspension loaded. Did you have an alignment done after the parts were replaced?

[GarmaZabi]

Did you tighten the bolts for the control arm bushings with the suspension loaded. Did you have an alignment done after the parts were replaced?

yes I tightened it with the suspension loaded, i didn't do an alignment.

[RSheiman]

Make sure center link is tight on the steering box, at the tie rods and at the idler arm. Also ensure steering mount at the idler arm is intact as it is a weak point on these cars.