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wouldnt other settings have to be recalibrated with the change in gear size?
The biggest things that I can see that would be affect by a change in gears would be shift points and speed readout. When you load tunes with the XCal2, after you select what tune to load, there's an option to set the gear ratio, up to 4.56. If you to 4.88s then you'd need a new custom written tune.