I've had this whine noise thinking it was the propeller shaft, but i went to the dealer this past saturday to have my rear differential flushed and i told them to check it out and i went under the car and we all concluded the whining was from the fuel pump and we didnt know if that was "normal". the tech checked and didn't see any TSB's on it. Since it was a saturday Acura was not open to call so i made an appointment for May 27th to have it checked out. hopefully it's nothing serious.

 

Let us know. I had my rear diff replaced earlier this year after I "heard the propeller shaft bearing", and now I hear the bearing again... or so I think.