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Power Strokes
7.3 Aftermarket
VDH Trans tuning?
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[QUOTE="DP-Tuner, post: 168009, member: 1753"] A great deal. On the 1999-2003 7.3 the speedo information is not in the PCM. It is in the ABS module. Bigger tires mess up the speedo and throws off the shift points. The Rev's per mile information is in the PCM on the late 2003 6.o's and up. The OBS guys can recalibrate the speedo from the tripometer. At one time I did tune for bigger tires, but it is not 100%. Once you go to a smaller or bigger tire all tunes have to be redone. Jody [/QUOTE]
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