using a trailduster/dodge plate cradle its pretty easy to use a 2wd chevy box.
i used one on my truck before i went to the huge radiator when i swapped the diesel in.
the big sas ford box is ridiculously easy to use though

its why i usually suggest that type.
but if you are set on using the ranger type, it should be pretty easy to install the frame inner section from a ttb chassis out of a salvage yard.
get the lightest duty 2 in lift front chevy springs you can find, or some waggy stuff. you may get away with stock fronts with the chevies but you need to be real smart on setting up the shackles with them carefully.
if i remember this right, the 2wd output-shaft is longer then the 4x4, so its not a good thing to try and adapt in this case as the splines on the 2wd may not be deep enough. simply modding the slip from a 28 spline to hold a section of 25 would be doable just not practical....best bet is to get a 4x4 trans and t case together.
you can use a 2wd v8 trans cut down to do this, seen that a few times. add 4x4 housing and fit 28/25 spl spud adapter to run stock rbv case behind 2wd aod or c6 trans. not ideal but possible. so in this case all you would use is the 28/25 spl spud, not sure if the splines are deep enough to allow that though with a 2wd rbv trans. need to measure them and see. i dont see advanced selling that spud for less then 250 bux though. the kit is like 600 bones...