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your not gonna fit a 37 with out some serious trimming or about 8" of lift
Walnuts is running 37's with 11" of lift and mudryder is running 38's
You need a minimum of 4in. of lift to fit 37s. Here is the link to the guy that i know has done it. He is an expedition/ford truck guru!
http://www.fordtruckworld.com/ew/profile/profile.asp?UserID=49835
just look through his photo albums and you will see everything that has to be done to get them to fit.