Everyone, I appreciate your advice & help getting this thing to separate. After trying the force of power steering, a BFH on slightly backed out 12-point bolts, and a whole can of PB Blaster, I finally got it to separate by actually driving it. Washboard dirt roads at 30mph. I backed each bolt out until a penny could fit behind them and put some RTV on the threads so that the washboards wouldn't back them all the way out while I was driving it. I just found a straightaway at Rollins Pass Road in CO and gunned it, when I pulled over to check, the penny-space was gone and I tightened the bolts up to make it home. I guess it took the force of my XJ on some serious impact to break it free, but now that I have it home I can see the rust was severe; the PB blaster only penetrated about ¾ of the way down. I suppose if I had let PB soak several days it might have worked its way in but now that the rust is broken I'm wire-wheeling it and definitely throwing on some anti-sieze during reassembly.