Just surfing info from, many vendors-
Once VIN code obtained to identify what you have
VIN code see what options.
SD trucksprings-
OEM style 3000# 4/1 replacementHd 4400# 6/1GeneralSpring Ford 99-07 springs Offers a few more rating options.
Ubolts most would recommend new- length though-IE if you have factory upper O/L etc would be variable. Which wouldn't hurt to pre soak old ones with some penetrating oil if doing it yourself, Impact, torch to heat may be helpful.
3000# most common oem, not sure though jumping to 4400 how ride effected?
