Gearbox is 2litres but most of us overfill it to about 2.2/2.4 litres. In the guides section it shows you how to fill it from the gearstick location (ie the top of the gearbox)
diff is about 1.8litres. Bit of a pain to do it without a pumping device, either large syringe is best or long bit if hose and fill it from a higher position.