Noise coming from front end

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I’m sorry to hear you're having trouble with your vehicle. Your Expedition's front end noise could be caused by a few different things. Since the noise changes when switching between 2WD and 4WD, it is likely related to the drivetrain. The grinding noise when engaging 4-wheel drive suggests there might be an issue with the front differential, transfer case, or CV axles. Even though there are no warning lights and the vehicle drives straight, it's important to have these components inspected to prevent further damage. A certified shop in your area can help identify the source of the noise and recommend the necessary repairs. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!