Hey, I need to replace the U-joint on the driver side front axle of my '87 Cherokee, it's completely gone and about to fall apart.

It's probably pretty self explanatory when I get it apart, but just wanted to see in advance if I need to pull the whole axle out of the diff to do this job or if the U-joint can be taken off without doing that. I'm assuming I will have to take the whole 4WD hub apart to get to anything in the first place, right?

Thanks.