Hello, I have the same issue: rumble-strip like sound/feeling on and off on my 2023 F150 with 3500 miles. Usually when coasting down a hill, once when uphill under low power. Rumbles in 6,7,8 then stops when the tranny either upshifts or downshifts. Pretty alarming when it happens about 3x/week. No codes and my dealer not yet sure about what this is.
