If the steering wheel shimmy's at 55 -ish, then the front tires need balancing. Otherwise front end shake could mean something loose or worn in the front like a bad tie rod, ball joint, wheel bearing, strut/shock or cv shaft. You can jack the front end and check for play by grabbing the wheels with tires on shimmying the wheel left and right(tie rod). Up and down(ball joint) or excessive play could be the wheel bearing. Any excessive play indicates loose components.
Need some more details. Vibration all the time? Only certain speeds, only when you accelerate, vibration in the steering wheel, in the whole vehicle?
go get 2 new tires and have the alignment checked on it
This is usually a symptom of excessive run-out (warped) on front brake rotor or rotors.
if your car only shakes when you are at certain speeds like 70 i would suggest getting your tires ballanced. tire ballance can cause shakes it usually is within certain speed ranges. example. from 0 to 68 the car fels fine. then fron 68 to 72 it will shake and then from 72 higher it will be fine again.
Tires,inner tie rod bushings, if the steering wheel shakes when brakes are applied - brake rotors warped.
If 4x4, replace steering dampner that is a bandaid, is not addressing the real problem. could be worn or bent steering parts, bad ujoints, out of alignment or bent or unbalenced wheel.
A certain speeds, your steering wheel starts to shake.
A worn out power steering pump, or steering box.
where is it shaking in the steering wheel or in the seat? shaking at certain speeds can be caused by a busted belt in a tire
Could be a minor out of balance condition with one of the tires, or a minor alignment issue that is unnoticeable at lower speeds. Also the tires may not be rated for the speeds you are attempting and are distorting. Another possibility is a harmonic imbalance, the tread of the tires may create a noise that causes a wobble in the steering, the sound is always there but raises to a harmful pitch at a certain speed.
if your car shakes while driving and gets worse at higher speeds usually means the tires need to be balanced and if tire damage (cupping) has already started your gonna have to replace the bad tires
It's possible, but unlikely. However it will shake violently at certain speeds and may damage steering gear and tie rods.