Ok My buddy bought a NBS 07 silverado 2wd with the 5.3. The 2wd tires were bald so he had the dealer put on wheels and tires off a 4x4 they had on the lot. Its not a big change in tire size just stock 30.79" tall tires to 31.6" tall tires. He brought it over for a speedo cal which I did the way Im used to doing which is put in tire size and axle and hit commit but that caused the light to come on so I searched on here and read that people have been making due by just changeing the general vss ppm setting. I did this and the light still came on. I attached the stock and the general ppm adjust files. Any help. I told him to try the dealer and see if their tech2 can do anything. Its not that big of a change, why is the abs freaking out.