Clunk click every trip

[Flight]

Hi all.
Sorry to raise the old chestnut of rear end clunks when gear changing, but I recently caught site of a article, in which the diff input shaft was removed, and a heavy grease was applied to the cavity. The writer insisted this was a sure fire way of curing the annoying clunk when changing. Has anyone tried this, what was the result, and indeed what is the theory behind it?
Flight.

[NZ00Z3]

Have you changed your old OE slave cylinder rubber hose?

Got rid of my gear change clunk by fitting a UUC stainless steel braided hose to the slave cylinder.