Thank you for this tip - one of the best I've had! For ages I've put up with the rattle and everyone says there's nothing that can be done without a total strip down etc.

Well, it worked for me too. Mine has 250K miles on it.
I overfilled it with the tranny in position and simply jacked the car up as high as I could on the one side and got it on an axle stand.
Got about an extra pint of Mobil 1 (only the best for this rare gearbox!) in. Noise gone.

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Cars owned: W108 diesel, hot rod Frogeye Sprite, unrestored pre war Hillman Minx.