I recently replaced all the rear brake hardware on my Taurus (wheel cylinders, shoes, springs, drum, etc). Since this is my wife's car I rarely drive it, just the occasional test drive to make sure everythings working OK. Well, I took it out on the highway awhile back and I noticed a bit of vibration around 65-70mph. I thought it was a tire/wheel balance problem so off I go to Tires Plus for the free lifetime balance/ rotation bit (bought the tires there). It still didn't solve the problem. It feels like the back end is shaking/ vibrating but I can't confirm it. Is it possible the drums are causing the vibration? I no longer have the old drums so I can't verify that's the problem. Any ideas? BTW- the drums were purchased at Carquest and were made in Argentina.