my daughters mazda is having intermittent shake and right hand drift in steering ,,,,she had a 4 wheel alignment and all shows ok ,,,,she needed a tire so we put same brand to be sure ,,tire pressure is same all around vehicle from 58-73 it shakes and pulls to the right every so light like it needs alignment ..alignment done and rechecked 4 wheel ,,,all good ...replaced both lower ball joints and axle shaft left side front last fall ,,all was ok ,,,needed left rear wheel bearing ,,was installed about 6 weeks ago along with rear brake pads and rotors .....which I am sure has nothing to do with front since alignment was rechecked ......some times ,,straight as an arrow ....no vibration ,,,,then back to shimmy and slight shake ,,almost like a shifted belt in a tire ????? any suggestions ????