The rear U joint seems to have been the culprit there was one cup that was dry and disintegrated. I couldn't duplicate the sound on the way home. Another small victory

I checked to see if the pinion nut was loose and it seemed ok. There was some gear lube in there and it seems to be leaking a little, is this something to be worried about?
I am going to see if I can get those rear brakes working better tomorrow!