110 tonne on the back ground to a halt, half shaft fused in the hub. Now needing a whole new axle. 
Here’s a pic of their new 250 tonne TGX 680 taking the strain.
that good old saying comes to mind!!
"oil and grease is cheaper than metal ! "
sorry to hear that, it dont just grow legs and walk out the diff where’ the 14 litres of oil gone that the diff holds■■? 
not spotted and oil patches on the floor where you park? when was your last inspection carried out? was it topped up then?