interesting solution to vibration
 

I was plagued with a bad vibration at 60-65 but a smaller vibration at lower speeds. the front end needed to be replaced and had front aligned and front tires balanced. still vibration.
went to get rear tires balanced and the tech couldn't balance them. when he opened up the tire he found water and a nail. he said it was probably fix-a-flat turned to liquid. I decided to replace both tires with new.

that fixed the problem.

had the tech not been sharp the vibration could have continued til I replaced a lot more parts. FYI, hope this helps