Hello all, I am new to the focus world and just bought a 06 focus se zx4. I been driving it lately and this only happened once so far but, when I was driving my o/d had disengaged and the light was blinking on and off. So I had pulled over turned the car off and then back on and no problem so far. I have had my mechanic drive the car and it seems at around 35-40 mph the shudders or I feel a vibration and it happens every now and then.
So far I have changed the trans fluid and filter because the trans was slipping thinking it would make a difference which it did but, still has the vibration.
I also have replaced the passenger side hub bearing and made sure the axle nut was torqued at 233 ft lb which I found in here before I did it.
So just trying to get some opinions.