Be sure to cheeck your rear wheel bearings if you car has 100k miles or you have a vibration you can not eliminate. I was changing my drag radials back to street tires and notice that my passanger side rear wheel move horizonily when I was torquing the wheel. I went ahead and pushed in at the top and pulled out at the bottom with the wheel off the ground and wiggled back and forth and noticed movement where there should not have been any. I checked my driverside and it checked ok. I replaced the wheel bearing and found it was totaly shot on the passangerside rear. If I had not it could have caused catrostropic failure. It was causing the vibrtion that I could not get rid of. It is much smoother now. I will replace my driverside next week since it has 100k on it also.