Why does the 2017 ford escape make a clunking noise in the rear end?

You're driving Your 2017 Ford Escape down the highway, when suddenly You begin to experience a loud clunking or grinding noise emanating from the engine bay, or undercarriage of Your vehicle. The most common cause of this problem is a bad differential. The differential in Your car is used to detect whenever a loss of balance within the vehicle occurs. This results in the wheels no longer rotating at the correct, or at a matching, speed. This sets off a rocking of the car's frame, and knocking sounds begin. If the differential has gone bad, it will need to be replaced. This will cost between $198 and $584 for a new differential.