On the front of the rear shaft the Ujoint fitting in there and the Slide yoke fitting on the outside:
On the back of rear shaft for the life of me I can't find more than one fitting. There's the U joint fitting and that's all.
So I contacted the local Service Department explained to him how the driveshaft clunking had developed and how by greasing up the driveshaft alleviated the issue. He helped me with the locations of the zerk fitting locations, it was pretty clear that I'd only hit the three on the back shaft. And then I asked for guidance on the amount of grease to pump into the slide yoke fitting. First he offered "a couple of seconds worth". Then I explained on the U joints how I go till it just starts to express, should I go double that amount on the Slide yoke? He said that what he does is he watches for the first sign of expansion of the driveshaft and stops right there.
I tried to observe for that expansion, when I was greasing up the front slide yoke zerk, I couldn't see anything after pumping a good amount in so I stopped. I don't have a good rule of thumb on that.
Definitely approach from the driver side(for the front shaft) and rotate the shaft so the zerks are facing that way.
Here the rear of the front shaft:
Here the front of the front shaft:
That's all 6.
Anyway that's all I got.