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My car has 40000 miles on it i did a test pulled it out of gear to neutral and the vibration still there but only at 80 mostly in the stick and seat going to get new tires soon
possibly your torque converter or input bearing. Hard to tell without physically feeling it. You need to take it in for service either at your dealer or local shop. Sometimes a problem like this is obvious but most of the time it takes some troubleshooting.