The Sahara had an option for the d40, at least that is my understanding? I have not visually verified it, it is an acquaintance that has it and mentioned it to me. He is a gomer so could totally be wrong. I like coils, but from what I am gathering I will buy the cj stuff and run leafs for a while.
I am not easily offended and obviously you have more knowledge and experience than I, so I can not argue.
Just for knowledge's sake how would you Boxcar go about a 3 link setup on a 620? My concerns with self fabrication is angles geometry and such, that is why I thought a take out would be the best solution. I know those are super important on my stock car. I also figured worst case scenario I upgrade axles later.