the gearbox then leaked from this one location:
the leak was coming from the plate 'A' which sits over the top of the 3 springs. now, after having removed it, cleaning it then re-installing, i noticed the plate does not sit flush with the gearbox. there's no sign of a gasket ever being there, so should it have one? or does it not matter and wont leak when upright in the car?
any help would be appreciated! thanks
oh, and the reason the output shaft seal was leaking was due to rubber insulation closing the vent on top of the gearbox in my e30. this has since been removed.

