Is it coming from the front side or the rear side? Check the differential fluid levels and take a sample of the fluid and check if there is any metal chavings in it.
If the diff fluids where not chanhed lately, its maybe a good time to do so.
Also possible that a wheel bearing is getting bad or a drive shaft coupling.
JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks /
Pirelli Scorpion ATR 245/65/17/
Transgo reprogramming shiftkit.