I have a 95 xj sport 4.0 4wd that recently started making a popping/clicking sound from the front end that i can hear at lower speeds. Turning the wheel doesn't make it any more or less apparent. While driving down the hwy yesterday, the problem became much worse. Its roughly two clicks/pops per rotation and it causes the jeep to lighly vibrate at hwy speeds. I replaced both hubs recently. Could it be a u-joint? Any ideas would be appreciated.

Likely a u-joint. See any rust creeping out around the caps on the u-joints?

most likely a ujoint but also check the hub to see if the bearings are ok