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Check to see if you lost a driveshaft weight. Maybe one of your rubber donuts on the driveshaft is failing. What I had recently experienced was a vibration at 80 mph. After inspecting the driveshaft and seeing no problems I disconnected the rubber donut between the trans output shaft and driveshaft and rotated it 120 degrees and the vibration virtually went away. I didn't mark the rubber dampener/isolator in relationship to the driveshaft like I should have before I removed my driveshaft and trans a few months ago. Try those things first. If that doesn't work you'll probably have to have the driveshaft checked.
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