Biggest Tires that will fit on a 2002 4X4 Crew Cab?

I have a 2002 4x4 Crew Cab and I was wondering what the biggest tires I can fit on it would be...... I know that my friend has a ZR2 and he has 31's with no problem, but my fenderwells are much smaller than his, currently I have 235/75 15's on it and they look like they are almost too big?

30 x 9.5, where as your stock tires measure out to be around 29 x 9

With a 3" lift you can fit 31" tires (2" will clear with some rubbing)

Thanks for the help :smooch: