[rustyBob]

Well now thats the kind of info we need to help solve the problem................
you had the car at the track raceing around haveing fun.........
did you change anything else ?????? tires and wheels maybe ?????
did you run he same tires at the track that you run on the street ?????
maybe you just lost a wheel weight or a flat spot in a tire or tread seperation
or maybe a u joint in the drive shaft??????......just some suggestions......
can you feel it in the steering wheel?????
do you feel it in the seat of your pants??????