I don't think it's the driveshaft, it's not a constant vibration. It varies with the road surfaces, and it feels like the wheels are bouncing up and down, like dribbling basketballs low and fast.
Is it bouncing in the front, back, or both?
I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them.
Thomas Jefferson