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Could be a lot of things....use the process of elimination.
If it's possible after you varify that all the balance is good, tires are not out of round, put the front wheels on the back to see if the vibration shifts to the front, or put some junker wheels and tires on the car to determine if the wheels or tires are the problem.
Next as mentioned check the drive shaft for balance and angle, then the rear end for possible bad bearings. Also check the front end for loose steering u-joints, loose rack and wheel bearings, its possible for a vibration to telegraph to the rear.
Anyway, just take it to a good shop that does front end and suspension work and have them check it over.
Best of luck, Bill
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