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Old 10-22-2021, 02:11 PM   #1
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Join Date: Oct 2021
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Speedometer calibration

Hello I recently replaced my ecm with a unit out of a higher hp engine to increase power. Has made a noticeable improvement but my speedometer is reading about 6 mph lower than actual speed. I think this is causing my automatic transmission to have some shift issues. Is there a way to recalibrate the speedometer myself. About 2.5 hrs to go to dealership.
2004 4300 with dt466e and Allison 2400. Thanks

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