I HAVE AN OLD EXPLORER SERIAL NUMBER 123444 THAT DEVELOPED AN ISSUE. LAST TIME USED IT WORKED FINE, TODAY IT DOES NOT DRIVE ON THE LEFT SIDE. THERE ARE NO LEAKS AND THE CENTER AXLE NUT TURNS, THE HUB AND WHEEL DO NOT. I TOOK THE WHEEL OFF AND THE HUB ROTATES ON THE DRIVE. I DID NOT HAVE A...