Quote:
Originally Posted by Vettezuki
If it were out of balance it WOULD get worse with higher rpm as the rotational inertia would be increasing. If it comes and goes through an RPM range, that's a harmonic thing.
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Not always, driveshaft, u joints and even pressure plate problems can all happen in a certain RPM range. Sometimes the rotation only effects them at a certain speed. I've dealt with it in one for or another on one of my vehicles at one point. I snapped 3 of the 4 joints in a u-joint on my driveshaft in my first f150. It would only vibrate in second at around 35mph then the rest of the time it was gone.