Hey! I love my 2010 Nissan Titan XD. I’ve recently had drive problems with it. Last year, I had to replace my rear differential. This year I have had to replace the bearings in my front axle. I still hear a loud hum when I hit 50-60 mph. The loudest hum is between 55-60 and then it goes away, if I go faster. I notice a little vibration at that speed as well. Any thoughts? Drivetrain?