Gosh--thanks for the replies.
I took the driveshaft out and inpected it. The bearing has no visible damage and turns freely. The rubber housing is in tact with no cuts/damage. The rear u-joint was tight.
I bolted the thing back in and drove it. I noticed at between 7 and 10 mph there is a rapid studdering vibration and then the sound stops. The sound is more prominent and louder if the accelerator is pushed. I also felt the shuttering when I had my arm resting on the center arm rest behind the shift stick. I figure its got to be in the center somewhere.
Thanks!!!!!!