Diagnose clunking noise

[ndlibgt]

As topic suggests in event times I've noticed a clunking noise emanating from the rear if the car only when cold. Used to only be audible under semi load momentarily but now is more prevalent. I fear my rear diff is in its way, ill try and get some audio off it later today. Has anyone else had these symptoms?

[LOWLIB]

would like to know if you ever found an outcome for this ??