Your car has a few things that can cause this. First there is a rubber

dampener instead of a front u-joint. This is right behind the trans.

The next thing is the rubber driveshaft support and the bearing inside of

it. These go bad and the bearing can seize making vibration in the drive-

shaft. Of course you may have a bad u-joint. Another possibility is the

torque arm bushings in the rear suspension are bad and letting the axle

rotate causing the driveshaft angle to change also causing vibration. I

would do a careful inspection under your car. If any of the rubber parts

are bad you can usually see that.