just wondering whats the biggest tires i can run under my stock 94 f 150 without any problems or rubbing. thanks for all the help

 

2wd or 4wd?

31x10.50x15 for a 2wd or a 32x10.50x15 on a 4wd. U can probably fit a 33x12.50x15 on a 4wd depending how much the coil springs have sagged, but the bumper will need to be notched and it will rub on the radius arms at full lock.

 

^ Thats all there is to know...hes completely right

 

What gearing is in your rig?

32's and 33's will likely make your truck noticeable slower without a gearing change.