binding noise in front end

I have an 82 d50 and I have replace the shocks, CV axles, upper/lower ball joints, inner/outer tie rods, leaf springs and all hardware, front pads, did 4x4 service, repacked wheel bearings, new tires, U-joints. The problem I am having is when i put it in 4 wheel drive there is a binding noise coming from the front end. A friend of mine thinks it might be something with the hubs. So I am cautious if anyone has any pointers or if anyone else has had a similar problem? Please someone help I don't want to ruin my truck.