I while back i remember we had a thread about this, how many MANY people's stangs would start this really bad shaking at speeds of about 65-75, and a lot of people thought this was just something that comes with the mustangs. It was really bad for me, but the other day I got all four new tires, (cheapest ones hehe), and an allignment done and the shaking is completly gone. The car drives just like it did out of the factory, I'm so happy. Anyways, I don't know if it was the allignment or the new tires, or a convination of both, but the shaking stopped, it isn't something that we have to deal with for having a mustang