um hmm you must not understand how 4x4 suspension is.
ok i know these arnt ranger but same concept.
thats 2wd spindle lift. 2wd the rotor rides on 2 wheel bearings that ride on a spindle you see sticking out of the spindle "arm"
ok here is 4x4
you see the knuckles "spindle arm" has a hole in it and no "spindle" per say on it. 1998+ 4x4 has a sealed wheel bearing assembly like so:
that bolts onto the knuckle. the axle goes through the wheel bearing and turns it.
know knowing this you cant run a 4x4 "spindle" on a 2wd.. that is why... see how a spindle lift works is the 2wd spindle we will say is in the middle of the arm. the new arms are casted so the actual spindle that the wheel bearings ride on is now 3.5" lower then stock on the arm. thus raising the truck up