Update is sounds like same as yours or shaft between gearbox and transfer box
So next job is to take out the gearbox and look and see what the clutch is like and if no signs there them look at the gearbox.
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Iv'e seen a diff brake all of its crown wheel bolts thus losing drive. No noise, smooth operation, just no drive. Maybe check if the tailshaft is still turning but not the wheels.
I put the car in first and started it and it ran with out going anywhere. I looked under and saw that either of the props shafts weren't moving.
I have had what you are talking about on my old winch challenge truck. That was Kam ring and pinion and ARB lockers. And that made a mess.
I have had fun with center diffs going but they make noise first. Last one was in a RRC at 60ks and it locked up. Car just violently stopped. Had to remove both props just to move it off the road.
But this was very strange as no warning.
Now in at Greg Tunstalls in Cleveland. They are about to take out the gearbox as it is either the clutch or gearbox / transfer box. So it will have to come out anyway.
Well taken the gearbox out and the clutch has shattered. So needs new clutch
But redoing some gaskets on the gearbox while it is out and replacing everything in the clutch. Putting in a 130 clutch.
Also new rear main going in as mine is starting to weep.
Don't want to be taking it back out again
But this was a new one on me. Never had a clutch go like that with no warning.