Not a gear head but need to be educated!
#16
#17
you probly have the 4r70w trans. 97-03 f150 auto trannys were 4r70w. and itll cost bout $1000-1500 for just one differential gear change (not including both diffs) if ya have a shop do it. it costs a pretty penny cuz of labor. stick with your stock gears if youre goin to 33s.
#18