When I go to purchase the extended parameters it says "This package does not have any PIDs for your selected vehicle." What year is your 5.7l? Mine is a 97.
I always ran 255/85r16 on my square body trucks. Won't this 33" tire require trimming out on the fender wells? My 265/75r16s that I have now rub sometimes. My 97 k2500 is stock.