Andy,
Agreed! In the opinion of everyone I've discussed this with so far, it's 99.9% certain to be the result of axle wind-up either due to tyre circumference or pressure differences. There is no inter-axle diff. I noticed cupping on some of the rear tyres and what I would have though was unacceptable play on the middle axle input shaft (approx 5mm axial movement as the prop is rocked, compared to almost nothing for the rear axle). This perhaps combined with a worn prop and the axle wind-up could provide the circumstances for failure.
On the bright side parts are available. There are at least 3 people who have parts trucks in this country as well as several European dealers with large stocks of parts (e.g. Jeepest, Army Cars and Ets. Beke in Paris). I would go for new parts wherever possible though, with the exception of the prop and brake chamber bracket which will have to be obtained. A second-hand brake chamber could be re-furbed as the diaphragms are available. I imagine the taper roller bearings are standard components.
- Mike