Clive I know where you are coming from, I had mine rebuilt by Road and Race about 2 yrs ago, the diff itself was very noisy, add to that the chatter of the LSD when you lift off, was bloody awful! Interestingly when they stripped it , all the main parts other than the lsd were patten parts , this would have fallen into place regarding the supply of Ford diffs, Caterham scoured the country looking for old Sierra diffs to refurbish. Mine was rebuilt in the end using Ford parts , the lsd though is still chattering from the lsd, but main drive is a hundred times better. i have a friend who considering doing away with the lsd, I can’t blame him ! Kingsley.