i have a daystar leveling kit on my 04 f150 fx4 reg cab... and i have seen people in town with no leveling kit... with 325/60/18s which measure out to be around 33.6-34" so could i put on 325/65/20s?? which are 35"s.... also i have seen a dude on this 4M that has a levling kit and put on 35s... but i cant remember if they rubbed??

And are Nitto Terra Grapplers or Toyo OP A/Ts good tires??? how many miles do they last??

 

yes, you can put 35's on with a leveling kit.. BUT they might rub. If you have an FX4, there is less of a chance of rubbing. The couple of owners who have 35's all say they rub on the full crank of the wheels but with mud tires or any agressive tread, Im sure it would wear down the side ***** quicker.
I decided with 33's because i tried putting 35's and unfortunatly they rubbed on the A-arm only when turning all the way to the right.

i have heard good things about those tires. they are an all-terrain so you can expect a lot of miles from them. look through the galleries to find some different set-ups.