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07 Te450 converted to SM speedo correction?

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Is there anyway to correct or recalibrate the factory speedo? Since I am running 17 inch wheels the speed is way off and my mileage is going up super fast. I called the one dealer he tells me I need the SM cluster I told him that make no sense since its the same part number he immediately hung up. The next dealer I call tells me there has to be a way to do it but they did not have a clue. Can anyone on here help me out?

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usally you do this by installing a speedohealer or an aftermarket speedounit. i don't think that you can reflash the stock ecu.

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