I recently purchased a 1999 4runner for my wife. I noticed that when she goes to lift the back hitch, it seems to be grinding metal with metal. I looked at the hinges and noticed there is what looks like a pin that literally holds the door in place. It looks as if the pin itself goes thru what I can describe at best would be a bearing of some sort. I dont know what else it could be but that is what seems to have worn completly down. Does anybody know where or what I am talking about? Any help would be greatly appreciated. Thanks