I'm going to say tires too, or something turning tire speed, like rotor, axle, differential carrier.
Typically drive shaft vibrations happen at lower speeds and level off above 40-50 MPH. If you can get it up on a lift, run it at the worst vibration speed and look things over. Start eliminating items, start with each rear wheel, each rotor, each axle. Then work your way forward, rear drive shaft, front drive shaft...
Eventually it will show where the vibration is. I assume you have tried bringing the engine RPM up in neutral to eliminate it being engine/transmission related?
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