Hi. I have a 2002 Super Crew and I noticed a slight vibration. I will say that I have been known to notice things that others don't but I am sure it is there....it's just that it is very faint. It happens in overdrive between 55 mph and 75 mph. It's like a faint vibration or humming noise. When this happens, nothing in the interior shakes or moves around but i can hear it and barely feel it in the pedals. Please let me know if anyone is experiencing the same thing. thanks

 

The Transmission forum it sounds like that or a drive shaft.