I HAVE A 1994 EXPLORER XLT 4 DOOR 4X4 EARLIER THIS YEAR I HAD IT IN 4WD AND HEARD A LOUD CLUNK OUT OF THE LEFT FRONT. NOW THAT IT IS WINTER I NEED THE 4WD, WHEN I PUSH THE BUTTON FOR 4WD HIGH THE LIGHT COMES ON AND I HEAR IT CLICK IN, BUT WHEN I MOVE IT MAKES A CLICKING NOUSE IN THE LEFT HUB...