noise from front hubs after reassembly

[quietrangr]

Last summer I replaced all bearings for the front axles. Afterwards, I noticed when hubs were locked in, in two wheel drive, a tugging when turning. I drove on a hard surface road, and when going around a curve, the humming got louder, then clunk. I thought something was broken, but it seems to be fine. I now only keep my hubs locked on mud or snow. Evidently, I put something back together wrong, but does anybody know what?