2005 Jeep Cherokee Noise

Did this noise start all of the sudden or something that has gotten worse over time? For it to do the noise both right and left, both wheel bearings would have to be bad, that would be quite a coincidince. Possibly a front diff problem. Has it ever been serviced? Ifit has any kind of limited slip in thefront diff, the clutches could be binding. I would try servicing it first, using the correct Mopar limited slip additive and weight oil they suggest