I had a chevy van with the factory tires on it. It would shake and vibrate in front, took to chevy dealer found nothing wrong, return several times same problem. Was driving steering started shaking, had no steering now, rolled off to side of road and up into someones front yard. Found that steering gear box had ripped from frame. Chevy dealer found that front tire are tires had a slipped belt,defective tires. Tires would shake violently left to right .