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1995-2002 Range Rover P38A
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I have just done a search and you are correct. A number of suppliers are now saying they are no longer available.

You could try Ashcroft Transmissions to see if they still have one in stock.

I did however find a place that rebuilds them Bell Engineering.
 

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1995-2002 Range Rover P38A
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I have just had a quick look on YouTube and I found a video how to service the viscous unit viscous unit unfortunately it is in Russian.
It is fairly self explanatory. The guy changed the oil and freed off the clutch. Bell engineering must do the same.
Apparently it is a silicon oil @ 10,000 cp viscosity and takes 250mls. Don't throw your old one away just yet.
 
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1995-2002 Range Rover P38A
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The viscous unit is supposed to slip at slow speed and act like a central diff does. The principle is that the oil viscosity increases at high slipping speeds, like when a wheel is spinning, and it grips more. The oil thickens up.

When I have tested mine on the car using a bar on a wheel hub, there is high resistance even at low speed. It needed a lot of force to turn it.

Interesting comment down below in the video comments section that Ashcrofts disagreed with his method.
 
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