Grinding noise from fromt end

The last couple of days I've started noticing a grinding sound from the front end. It only happens when I'm decelerating and its not constant. My jeep has a RE 3.5" lift so its more like 4.5 and I don't have an eye or tcase drop so I'm almost thinking I'm just getting some funky drive line noises. All the front driveshaft and axle shaft ujoints where replaced less than a month ago and the hubs are only about a year old so I don't think its any of those. I just want to get some opinions before I go shellin out the money for an sye.