Front End Moaning

01 ranger 4x4 4.0L. I have a front end moan, I replaced the wheel hubs and did new brake pads and rotors. the front end is still moaning. Not as bad as before but it is still there. I was thinking maybe the front half shafts are going? what do you think. How much are new half shafts? I didn't check the axle lube to see if it was low, but i don't think it is that. no signs of leaky Diff case. thanks for the help. Chat back soon.