Recalibrating Speedo
07-26-2007, 08:27 AM
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Recalibrating Speedo
I am taking my truck in to flash ECM and I want to have the speedo calibrated but I am not sure what the pinion factor should be and I want to double check what they tell me it should be. I have 315/70-17 tires and 3.73 gears on my truck, does anyone know the number that should be used?
07-26-2007, 08:41 AM
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I am taking my truck in to flash ECM and I want to have the speedo calibrated but I am not sure what the pinion factor should be and I want to double check what they tell me it should be. I have 315/70-17 tires and 3.73 gears on my truck, does anyone know the number that should be used?
07-26-2007, 09:01 AM
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I believe, depending on your year, they can only go so high. I have an 06 and they can only go to a 285 size ratio max. You may find your speedo still off but better. For my 285/70/17 that factor is 636. If you have a programmer like the Triple Dog or Smarty you can correct the full amount.
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