Originally Posted by sonoma_zr2
you did not mention brakes, but I have had rotors do this. they only caused vibrations at certain speeds.
I had a caliper that would drag and then heat up the rotor and cause a vibration from the rotor and caliper interaction.
I would stop the car quickly using the emergency brake that was rears only and compare the temperature of the front rotors. Left slightly warm, right HOT.
Replaced calipers and rotors and new pads after I put up with it for 15K miles waiting for them to wear out.