The Salisbury axle on a Defender 110 was used through the Series era until 2002. It has a reputation of being very strong, but also not very DIY friendly, as the pinion is part of the axle casing and the diff carrier removed by needing to spread the axle casing apart. So to replace the differential you would effectively need an entire new axle....
There is an element of expedition planning that needs to be done, but there comes a point when there are things you will never know unless you actually do it. And then of course there are the random events that make expeditions such fun that they make up the tapestry of surviving as a self sufficient unit....
My choice of tyres were 235/85 R16 BF Goodrich All Terrains. I've had experience of using these in Ghana. They have a good reputation and a lot of people use them on expedition. They're more versatile than mud terrains, being good on surfaced road (as the vast majority of my time spent I will be driving these)...
In the 300Tdi engine, the water pump is located quite high in the engine (near the cylinder head). A relatively small loss of coolant can result in the pump sitting high and dry and the engine overheating....
