what transfer case comes in which model?

I am searching for an XJ to purchase, and would like advice as to which transfer case models (OEM) are most desireable, and which trim models they typically are found in.

I grew up with older Jeeps, so am partial to 231's, I think. I like 2001 Classics, but if the Sport model is what I should be hunting down, then that's what I'll do.

There's a write-up on this in the FAQ section. It's pretty informative if I do say so.

thanks, I'll search again!