i have a 2wd 97 f150 with 3inch bl and 1 1/2 coil spacer in the front. What is the biggest tire size i can fit with my stock rims. the tires are i think 255s on it now but i dont know the backspacing on the stock wheels please help.

 

i think you can fit 33's but dont hold me to that!

 

I agree. I'd go with a 285/75-16 (33x11.50) or a 305/70-16 (33x12.50).