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No. Options like the snow plow prep, the stabilizer, heavy service suspension, and camper packages will modify springs, but the FX4's (both the option package & newer trim levels) get the same springs as any other Super Duty.
but how different? maybe more coils? or stiffer? i did see a reasonably priced set of air bag struts.. but i think if you want any automation in it so you dont have to air them up manually they really rape you...