fasterblaster

Hi, I have a 2001 defender Td5 with about 80K miles on the clock. I recently changed the gearbox oil and found black fibrous bits of plastic in the oil. From what I have managed to read the oil pump may have fibre teeth. However, I think the later R380 oil pumps, as in the TD5, are an all metal construction. My other thought was it could be the oil feeder ring as that looks like it is some sort of plastic. Any thoughts on what this could be and the implications for the gearbox? Thanks.