i must say scott's (blackyj) setup is almost as good as the np231 can get. i believe its the tera 4:1, tera 2 low kit, super short shaft from jb conversions. the only thing better is a roctrac 241OR or the heavy duty version 241 from a dodge mixed with a jeep 231.
there are a few cheep ways to make the 231 stronger, you just gotta do the research. good luck.
p.s. sorry scott, i spent too much time checking out your jeep;)