whats the difference between 2wd and 4wd steering box

[hilljob26]

i was wandering if a 2wd steering box was any differnet from a 4x4.i currently have a 1980 blazer box on my 72 and it doesn't seem to turn very sharp and some have told me that 2wd have a tighter turning radius.is this true,and ifso,does anybody have a 2wd from that style seems how the lines are different,they have a little straight part that comes down unlike the older ones.thanx...mike