So I have a truck that the speedometer is off 10 miles an hour. (slow)
I have made gear ratio and tire size changes in the BCM.
No change what so ever.
I have disabled the VID in the PCM and changed gear ratio and tire size.
No change what so ever.
What am I missing
Also checked HEC and ABS modules.
As Built Data looks ok.
Ideas?taylors 6.2 superduty.hpt