will 305/55-20 tires fit on my ford f-150 4x4 with a 2 inch leveling kit

 

They should. Are you on stock 20" wheels, or an aftermarket set? Stock should be fine, you might get a tiny bit of rub at full lock.

 

yea i still have the stock 20 inch wheels

 

Make sure you get your PCM reprogrammed for the correct tire size (or your odometer and speedometer will be off).

Please note even if properly programmed, your speedometer will always read 2-3% FAST (i.e., will read about 67 when you're really travelling 65).

 

i have a super chip chip which i can do that with

 

Good deal. Make sure you account for squish.

Your unloaded diameter should be about 33.2" (843.5 mm), 2650 cm circumference or 607 revs/mile. With a 3% squish (most tires are between 3-5%), you should be about 2446 cm or 626 revs/mile.

Always verify with a GPS or known distance.