My first thought, is there plenty of oil in the diff? Good oil as well, it could be pretty dodgy now if it's been in there a while, especially if you have been off road a bit. Could be some water/mud, etc in there.
Just my thoughts. I hate thinking the worst straight up. Though if it's already making heaps of noise then it's possible some damage had already been done.
A few of the better mechanical types will jump on soon enough to give you some more suggestions.
Chris
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Chris Phillips
Offroader: 1996 Discovery 300TDI (The Green Donkey)
Missus: 2010 Discovery 4 TDV6 (Fancy thing)
Just 'cause: 1999 Discovery SE 3.9L V8 (Makes fun noises, sometimes...)
Spares: 1998 Discovery 300TDI (Only vehicle actually in the garage..........)
Run around: 2001 Nissan Pulsar ST 1.8L (Soul crusher)
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