I was driving the other day, and hit a bump around 70mph, the steering went to shaking BAD. slowed down it was good again. Could it be the center link or what else?

 

the year of the car will help and any mods that have been done

 

Need more info on the car...

But it could be any of the following:

Hub
Wheel Bearing
Ball Joint
Tie-rod-end
Rag joint
Rack
Steering box
Draglink,
Pitman arm

All depends on the car (not all cars have all of these); but those are normally the places to look for what you described.

 

Could be a swaybar or swaybar end link, too.