After changing the oil in the gear & transfer box on Saturday I now have a couple of flat pieces of metal, some filings and a tooth that I retrieved from the bottom of a bucket I used to catch the old oil.
Changing from 3rd to 2nd gear at anything above walking pace is always a bit lumpy, I presume these bits belonged to second gear.
Otherwise the gearbox seems fine.
I'm sure getting rid of this excess metal has added 2 mph to my top speed. :-)
How worried should I be? :-{