The most likely cause by far is the hand brake shoes rattling against the backing plate, and wearing a groove.
While driving at 2200RPM pull the handbrake on lightly , and if the rattle stops then BINGO.
You can weld the backing plate and /or replace the shoes. I took some pictures of the wear some time ago and posted them.
I am told it is better to Braze the wear points in the backing plate as brazing has greater lubricant properties .
There is a factory fix of really strong retention springs (red) but I couldn't get them compressed enough to fit the little turn retainers after I fixed my backing plate.
Regards Philip A


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