I have read numerous posts regarding tire changes, however I have yet to find anyone who has successfully changed their speedometer back to an accurate reading for the Supercrew. I'm going from stock 255/70/16 to 285/75/16. I have called every dealer in town(Denver)as well as 4X4 shops and others. I know my speedo will be off by approx.9.23%. But I would like it to be accurate. I drive approx. 2500mi/month. Can anyone please help?