i'm in the same boat with this question...well at least for the tire sizes...i would have thought that a 315/75/16 would be to wide for the factory wheels, if you had a load on them...
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Ryan
2001 4 X 4, 3500, 2nd NV4500, II SO VP, NEW VALAIR CERAMIC CLUTCH AND HD HYDRAULICS, TSTPM3, Edge EZ, AFE, FASS 95, free 5" straight pipe minus down pipe, gauges
399/1116 2/2/08 before EZ IF IT CAN BREAK, CHANCES ARE I WILL BREAK IT