OK, so the internet is a great tool. I posted on some boards about my jeep not running and within 10 minutes it was diagnosed as "Crank Position Sensor". Apparently this is a common failure for the 4.0 Motor. I was able to find the part at O'Riley's here in town, even cheaper than the on-line sites, so that was nice.
When I meet the engineer who decided it was a good idea to put the sensor on the back side of the bell housing, near the body of the vehicle, I will have some stern words for them. After about 2 hours of trying different extensions and different sockets (a 15 inch extension with an 11mm Wobbly socket works) I was able to get it out and the new one back on.
The good news is that it fired right up, and now runs more smoothly than it ever has. I would post the picture that my wife took of me all greasy past my elbows, but I look kind of dorky in it so I will spare you all that visual.