Why is this, and is it the same for manuals and autos? Not sure if the different gear options make a difference. And am I off my rocker here? On paper I could build a 231/231 doubler for less than finding or building a single 4:1 tcase, but is that more trouble than it's worth?
From what I have found there is only maybe one company still making the crawler box kits. Where 15 years ago there was like 6-10 companies that offered a kit to convert the 231. Unless you have a LJ I think the length of a 231/231 would be too long.
This is why what Gollywomper did is the better option.