Loud screeching noise

My vehicle has been shaking really bad, almost like a hard and heavy vibration coming from the steering wheel. Recently, I have noticed that my car will start shaking and that it makes this horrible loud screeching noise when I am driving. I know that it does not have anything to do with my wheel alignment because I just got new tires and when I brought it in, they checked my wheel alignment and said everything was fine. I really do not know what is going on with my jeep, but I know that i is not right.