the other day me and some buddies were out wheeling, i told my passenger too jump out and lock the hubs, he locked the right side, then got too the left side, and tried it he said it was "locked" i thought he meant he put it in the lock position. he meant it was stuck. he left it halfway in between free and lock... we went wheeling and no problems then on the ride out home on the highway i hear almost a howling like when im going over 30 but no other problems what could it be??? thanks