eclou

Does anyone know how close a tire diameter ratio the center diff will tolerate safely? The stock size 225/40/18 and 285/30/18 have diameters of 25.1 and 24.7, ratio of 1.016. I need to run (temporarily at least) 235/35/19 and 305/30/19 tires (stock 997tt size) have diameters of 25.5 and 26.3 with a ratio of .969, which is a 4.6% difference.