It sounds like road noise but the tires are new and so are the bearing assemblies. I had a bad one and replaced it recently. What I have sounds like road noise associated with tires. Everything is normal starting out. When it makes the first shift at around 20 mph is when I begin to hear it. It kind of builds in intensity up to about 40 mph with a slight vibration through the floorboard. The sound remains constant until about 60+ mph and then starts to get louder. The floor vibration builds up also. I can feel it in the break pedal and throttle but you can feel it more on the passenger side. Everything seems to shift ok and the fluids are good in the tranny. Any ideas on this one? thanks