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You cannot change this with a Tech2 or HPTuners or EFilive. Like posted the only fix is new tires again. At least making the fronts a 30 series should do it I believe.
GM and its suppliers are the only ones that can change those calibrations. It isn't something simple like changing an engine tune and if the person doing the changes doesn't have sufficient knowledge of how ABS/TC/AH systems work they could end up killing somebody.
Wow - you guys are great!! - Will be getting new rubber ASAP. Our club is having its BIG Corvette Show this weekend. (clubcorvetteri.com) - Really nice State Park! Thats Rhode Island - - NOT Long Island!!