My understanding is they are not a straight swap. The Disco from memory has a short input shaft and the Defender has the long. However without knowing what was actually fitted to the RR hard to say. If you get the gearbox number and go to the Ashcroft site they have a section to identify the box.
http://www.ashcroft-transmissions.co.uk/
I have just replaced mine with an Ashcroft unit with HD bearings, brought outright.


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