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Ford 4.6 and 5.4 Liter
Evolution
The default value the Evolution displays is the current value stored in the
PCM.
Adjust the value displayed by pressing the [UP] and [DOWN] arrow keys.
You can change the gear ratio from 2.73 to 5.13 in increments of 0.01.
Changing this value will allow your PCM to accurately calculate vehicle
speed and odometer readings. These changes will also affect your shift
points.
Tire Size
NOTE: When using the Evolution to recalibrate your truck's factory
speedometer, please note that: Both the tire size and the gear ratio must be
adjusted and corrected to match what is installed on the vehicle for the
speedometer to read correctly.
The Evolution has the ability to correct for changes in tire size. If you have
changed your tires to a different size the PCM will miscalculate vehicle
speed which can affect shifting as well as the speedometer. Correcting the
tire size will allow the PCM to accurately calculate vehicle speed and
odometer readings. You will not need to change the value displayed if you
are running factory size tires. After choosing to set your tire size, the follow
screen appears:
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