After little bro drove middle bro's Ninety across a roundabout there was a bang and no drive. In gear when the clutch is lifted there's a crunching banging sound and no drive. With the centre diff locked, it drives fine. I expected a halfshaft or diff, but he pulled the rear axle bits out, all is confirmed ok and needs no dental work. Excellent, but also bad. Further diagnosis shows neither propshaft is turning when the diff is unlocked and the banging noise is summoned. When the diff is locked, both props turn.
What's broken and how do I fix it? I guess centre diff, but is it rebuildable? I have a spare T-box which is full of swarf.