When off padel does not shake. But when in hwy speeds it shakes when getting to 60mph. What should I looked for i thought it was spark plugs but it not.

Bad vibration at highway speed intermittently. Starts at 75mph and peaks at 80. Factory tires, rotate every oil change. When it slows below 70 vibration stops. Doesn't happen every time and is more pronounced in 2wd vs AWD/4WD. Had tires balanced last rotation and still happens. It feels like its coming from the font passenger side but is not visible from another car following next to me.

Vibra cuando entran los cambios, ya le remplazaron el convertidor, pero continúa con el problema!