Fiat Ducato 290 1993 2.5TD Gearbox Oil Change.

Whilst on my travels I have come into ownership of this van which is in need of some tlc. She's done 392,000km. The gearbox leaks via the drive shaft seals which I hope to fix when I have returned home. I noticed after driving for an hour or so gear changes would be very troublesome though I didn't expect so little fluid to be in there. Poor van.