Brad,
Maybe you should explain that to me again, I don't follow you. I would think that if you changed something before the point at which the speed is taken then the speedo would not be off (such as tranny gearing). But if you change something after the point in which the speed is registered, then it would affect the speedo. In this case, if I were to put bigger tires on my truck, the tires would move the truck a little further with each revolution and thus the speedo would be reading a little slower.
Make sense?
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