I was driving at about 30mph and just accelerated (I don't think it even dropped down) then with a very slight thud, all drive had gone... I tried lo whilst rolling, it crunched in but no drive, I tried difflock but same effect.
Have checked oil which is good and full. Someone on here did say it may be a shaft between tranny and box losing splines (could have been you).
tbh I don't want to get involved with removing the box. My wife is trying to convince me to get something else (and I am tempted) but we're both emotionally attached to her (Disco that is) and I've done loads of stuff to keep her going already!