Why does my front end & stering wheel shake violently when I go 60 mpr or high? on 1999 Chevrolet Blazer

I bought it used & the auto shop said it was running great!!!!!

Asked by for the 1999 Chevrolet Blazer
2 answers
rotate and balance tires 1st,this is the best thing to start with then adv so we can go further for you
Front wheel bearing