Hurray! Vibration problem solved after almost 2 years of agony...

[Monkeynator]

I suggest always getting a road force balance. If a garage/wheel place does not have the appropriate machine or do not know about this, then don't go there. My WRX had horrible vibration problems that the jacknuts at Sears would blow off as being the sport suspension, or some other tire defect. Then I got fed up with them, and had another tire shop I know take care of the problem. My WRX has driven smooth as silk for the last 8K miles, AND has less weights on it than Sears kept putting on it.

I found that with my other vehicles this was also the case, and the best balance jobs had the least amount of weight added to my wheels.