2005 trafic 1.9dci 100 gearbox removal

Hi guys if anyone could help please let me know, I've acquired the van and the gearbox I believe may be shagged, started with crunching into second when down shifting, no 5th gear, sometimes had to fight it to get it out of reverse, so I bought the correct tranself oil (expensive!) and started about removing the current oil, now according to Haynes all vivaro/trafic/ primastar gearboxes take 2.7l of oil yet when I drained mine almost 4 litres come out, I reffiled with 2.7 litres, the gears...

2005 trafic 1.9dci 100 gearbox removal