After days of worry with a viberation at the speed of 40 up. I changed the tires back to the original . STILL THERE. Checked ALL the pullies and what ever else I could think of, STILL THERE. Today I was out at the ole Gal,Our dog (****Shew)come from around the corner, she has got of the yard , I called for her to come here, she goes under the car and would not come out so I went in after jacking up the car. While under there I hit the drive shaft. SOMETHING didn't seem right . I dropped the drive shaft went got a new Ujoint installed it . VIBERATION GONE, Molly gets a doggie bone I get to cruise smooth,and find a hole in the fence..