Thread: Gear ratio & tunes?
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Old Wed, October 14th, 2009, 07:31 AM
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I have had no issues with leaving it as it is. You can change the values to the correct ones, but I saw no difference between stock and 35" tires on a customer's truck when the proper (or improper) values were used.

You can make up for the taller tires really easily by just shifting the entire shift schedule up by 2-3 MPH in each gear range. These trucks don't use the PCM for speedometer calibration anyway so it's not really that important.

The 99-up Super Duty trucks are more dependent on these two parameters though.
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