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That would make sense with Ford not changing the gears for 37's.If what I have seen is correct-
35" 0-60 = Approx 5.2 - 5.6 sec
37" 0-60 = Approx 6.2 - 6.5 sec
can a guy reflash the ecu to 35 spec if and when you change tires and want to go to 35S?