Deviating OT slightly, but regularly driving both 4x4 vehicles and one which runs in 4x2 most of the time, I can't see why anybody would want to fit 2WD to a vehicle that normally had permanent 4WD unless you like doing donuts
The Ranger is useless in 2WD and often gets stuck on wet grass even with AT2 all-terrains on! This is partly due to the lightness of the back end when unladen but I honestly can't see any advantage in day to day use in having 2WD instead of permanent 4WD.