Here's my story. Put 6 new tires on, took it to alignment shop. Went for a test drive & @ about 40 it went into the dreaded death wobble. This guy with more body piercings than tatoos said "need to swap sides with the fronts" I just looked out the window and rolled my eyes. After swapping them, rechecking alignment we went for another ride. @ 40 he let go of the wheel and it was solid & strait. Wobble never came back. That was 30K miles ago. He said "something about the construction of some tires" he had ran into this before several times. I was speachless.