Thanks for the heads-up cLAY, the Trac-Lok D44a is now out of the 5.9 and awaiting installation under my ZJ! It was a heroic one- man wrenching effort but I got it out with 5 minutes to spare before the place closed.
Sadly, the driveshaft was missing, so I'm on the hunt for one that's the correct length. I hear the 5.9 D44a used a larger u-joint than the 5.2 so it may take a little work to find the right shaft and joint.