2012 Ford Taurus “bucks” at 75 mph

does my car need its transmission filter cleaned by 125,000 miles; it is sort of “bucking” going down the interstate at 75 miles per hour

125k miles is WAY PAST when it should be done. 30k - 60k miles is the norm.

Does the transmission shift normally as you’re accelerating up to that speed? If so, this sounds more like a fuel delivery issue than a transmission issue to me.