haven't been on here in quite some time. used to have a 2wd 05 all jacked up. i recently picked up a 06 lariat 4wd with a 8" CST & a 3" body on it. I added a 2.5" leveling spacer to the front stacked (i know the dos and donts of stacking, so don't need to hear about it). iam now trying to fit a 39.5x13.50r20 irok swamper to it. any chance of this clearing? wheels are a 20x9 with a high offset, not much of it sits outside the fenders right now with 35's on it. don't know the exact specs but i suspect it being a 20x9 because of the way there isn't to much offset on the wheels. here are my current specs:

8" CST w/ uniball UCA's
2.5" leveling spacer
5" blocked rear with 2.5" AAL
3" body lift
4.88 yukons
20x9 high offset wheels
35" toyo mt

looking to go to 39.5x13.50 irons.

 

Since you have the full 2.5 coilover you can stack a level on it. It's the same result as you doing it to factory struts. I'd get some different wheels and swampers if it were me. The only way to find out if it fits is try!