Early boxes had a dip stick, The later boxes were drain and refill, I doubt the hole is the correct level for an indication. There were several different boxes in the ducato ME5T ML5T MG5T MLUC MLGU so you will find different recommendations on oil quantity. There were oil starvation issues with 5th gear in some early boxes so the fill was revised from 2l to 2.7l. If yours is on the heavy chassis in 2000 the 2.8idtd box is I think MG5T and 2.7l fill. From 2001 onwards the MLGU box was used and 2.7l is again the correct fill. Make sure you use the correct GL spec as some of the early boxes had bronze syncro that are damaged by the GL5 additives.
not sure which model you have but drain and refill through breather on top of box, (if you cant get to it from underneath take top off air filter for better access) i put and extra half litre in mine and a tube of molyslip
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