tire size and gear ratio

ok I have a 99 xlt 4X4 sohc v-6 I have 3.73 ls gears and i was wondering what is the biggest tire i can put on there with out messing with the gears
thanks

 

[Redrig]

any larger tire is gonna make your gear ratio higher. The max i would go with your gears is 33's. Recommended would be 32's.

 

[dloc420]

ice cold thanks