I have an 84 K-5, which makes a very strange,(and likely bad), sound when in 4WD. It is slightly rythmic, and sounds like a droning rubbing, but comes and goes. In my owners manual it says that if one hub is not fully engaged, it will make this sound. Recently I replaced my rotor on the drivers side, and could not get all of the play out of the wheel, when I repacked the bearings on the auto hubs. I tried three times but it just had extra play no matter what. I never really put it into 4WD until this happened so I dont know if it happened before. Also my truck pulls, when braking, to the left. I almost lose control everytime I brake hard. I thought it was my scarred rotor, but it still does this, could all of this be do to the hub bearings being not tight enough?