Have push-up diffy with a jack on both fron and rear ends, it has lifted up by not more than 3/32" on front and 1/32" on rear so I don't think there is a problem there.
But found a flat spot (usual running position) on both u-joints of both short and long DS. It should have worn-out gradually so I don't think it does cause a new knocking sound, except if wear has reached a stage that is starting to make noise.
I still be confident that agged carrier bearing does cause the problem has 5 years ago