why does my car make a growling noise at 40 MPH?

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My Toyota RAV 4 makes a growling/grunting noise at 40 MPH after about 5 mins of driving. It is not the tires which the dealership told me. The tires on my car did need replacing which I did. The mechanic at the local shop told me it was a pin bearing on the transmission cover, if my memory serves me correctly, which I told the dealership. My car is under an extended warranty which is due to expire 1/14/19. I have another appointment at the dealership first thing in the morning on Monday. I want to make sure this problem is resolved tomorrow prior to the warranty expiring.