Thread: Correcting spedometer for tire size
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Old Tue, January 4th, 2011, 10:36 AM
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As Dave has pointed out (thanks Dave!):

The SD trucks have to have the vehicle speed sensor data changed in the ABS module to correct the speedometer/odometer. You have 6 chances to get as close as you can.

The OBS trucks have the programmable speedometer/odometer module. The series of steps you listed there are to reset the speedometer/odometer on those trucks.

Either find a way to reprogram the ABS module for the tire size, buy a VSS inline correction box (such as the Tru-Speed), or do the math a suggested by Longshot270.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
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