YOUR FRONT ROTORS ARE WARPED. YOU NEED A BRAKE JOB.
Your front brake rotors need to be machined or replaced.
If it shakes all the time it is a tire/wheel problem. If it only shakes when braking then it is a brake problem.
You probably have severely warped front brake rotors. Machining or replacement of the rotors would be necessary to correct the problem
Your front tires are defective. Its time to replaced them.
usually steering shakes over 60 mph is due to front tires needing to be balanced unless you have something more serious going on.
Steering wheel shakes
Your automobile may have a tire out of balance or a worn part in the front end causing this "shimmy" effect .
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.
depends on when it shakes if it shakes when you put on the brakes-warped rotors otherwise it could be ball joints, steering joints, wheel bearings or even out of balance tires
Check the front tires/rims for snow packed in them. That can cause it to be out of balance.
if it shakes while your braking your front roters could be warped or if it shakes while your driving try balancing the tires at a tire shop.