Do yourself a favor and pull the entire output shaft. Its held in with 3 bolts. Be sure to loosen the 2 pinch bolts on either side of the block before you attempt to pull the assembly. Watch for the shims between the engine block and out shaft assembly. Once the output shaft is loose from the block, they slide right out. The shims are half circles, a left and a right make a pair. Seems to be common to find 2 or 3 pairs of shims. Its nothing difficult, just make sure the left and right shim stacks are the same thickness before reassembly.
It only takes a few minutes to do this and will make it much easier to disassemble the u joint.
Once you pull the unit, mount it in a vise. The circlips on the u-joint come off pretty easily. Only hard part is they tend to spin in the groove. After the circlips are out you will need to press both bearing caps out of the yoke in order to remove the u-joint body.
If you intend to loosen the output shaft nut, now is the time. When you put the nut back on, use locktite and take your time. The nut needs to be tight enough to remove freeplay in the yoke/shaft but, you still want it to turn smoothly without a lot of effort. Take note of the existing freeplay and get a feel for how it turns before you remove the nut. If you make it too tight you will have to remove the nut, push the shaft out of the aluminum carrier, and replace the collapsible collar. They are cheap but it sucks waiting for parts. Not that this ever happened to me.
