Well, I was coming home from work today and the speedo needle just dropped and the tranney came out of overdrive. I have had this happen before and all I had to do is thump the front of the instrument cluster and the needle work just jump up to speed and the tranney would go back into over drive. Today of course thumping, hitting and yelling did not fix it. I got home and pulled codes and there wre none. I checked all of the fuses and I am going to Ford to pick up a VSS in the morning. Is there a way to test the sensor? I don't think it is the vss. I think the speedo itself is bad.Can the speedo it self go bad? I pulled the cluster out and I do not know which wire goes controls the speedo its self. Am I right or can some one tell me what to do next. Oh, I did a search and did not find any help. I like the search feature myself it keeps me from haveing to type that much.