clunk
U/ joints can hide issues when checking them in situ. I would remove the prop then you can pull forward and back as well as checking for rotation issues on all joints. Also check the centre rubber mount and bearing on a 70 model.
My 70 Amazon also has a slight clunk when rocking the diff input flange, though nothing can be heard during road use. i assume this is normal. Also check the rear drums are tight on the tapered half shafts. Go for the simple items first.
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