Tim:
According to the drivetrain diagnosis section in my Ford service manual, the 2 things to look for when a vibration occurs suddenly are 1. A wheel balance weight that has been thrown off, or
2. A driveshaft balance weight that has been thrown off.
The cause may be something else but these are the things to look at first.
If you're missing a wheel weight, you should be able to see where the weight used to be. You will have to look at both sides of each wheel. The same is true for the driveshaft.
Another possible cause would be a tire that has slipped on the rim and is now out of balance. They will do it.
Herb
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