Sorry, I said the diesel too, moreso because I find humor in even thinking about a 5.9 in a unibody pos like a XJ.
I drive a pos xj for my current wheeling rig so I know what a pile the XJ platform is. I wheel it, grocery store it, teach my daughter to drive in it...but V8 or 5.9 it?
I'll save that for the rig that has a frame.

SD