2011 Toyota Highlander drivetrain & axles problems

Vehicle makes a very noticeable, irritating whine or whistle noise when accelerating at 40MPH. Stops when gas pedal is released. Very constant and annoying. Did not happen when car was first purchased. Have been told by toyota that it was the transfer case, which they replaced. Did not fix the problem. Now they tell me it is normal. Test drove another vehicle from their lot of the same exact year, make, model. No noise at all. This is not normal. Toyota knows about the problem, but they are denying it.

Driving on a city street at about 35 miles per hour I was heading home with my kids (5 y.o. And 7 y.o.) when the vehicle decelerated and lost power while I was driving in traffic, I was fortunate that the care rolled long enough to pull over to a safe spot with my children and call for a tow. Lights that came on check hybrid system, check brake system, check 4wd system, and the check engine light came on.