I have a 92 K2500 4x4 and the fron hubs are locked up. They stayed locked in after I shifted out of 4hi the other day so the whole front axle keeps turning causing some vibrations at different speeds. Does anyone know what activates the hubs on these trucks? Or has anyone had this problem and have any tips for getting them to unstick? I am thinking they would probably disengage if it warmed up but I am unfamilar with how these work since in the past I have had solid front axles.