mcm4090
Explorer
Any idea why some lift kits (PRG, for example) require a new set of control arms to achieve the same lift?
ICON and Radflo have two version to their coilovers (I don't know about king). The version design to used with an after-market control arm you can gain about an inch or so more of travel. The version design to work with a stock upper control arm has internal stop to prevent coilbucket contact.
If you purchased a standard coilovers and later decide to get UCA's you can have the stop removed. That way you don't have to dish out the cash for UCA's right away.