This is more of a question than an answer. Bob, I have a letter that I received from one of the car magazines a year or so ago dealing with Ford speedometer gears and they told me that each tooth is worth approximately 4 MPH in speed. We addded two teeth to a friend of mines car which by the radar was reading 10 miles an hour fast and it now reads about 2 miles per hour fast. Is this a fact or did we just happen to get lucky ? I did print out the sheet that you put in your post and will use it for reference from now on.
Thanks,
