Guys, all you need to do is try it.
Any Land Rover enthusiasts will know that the LT77 gearbox is a real problem with rough gear changes. Tried several other transmission oils. XADO claimed that their 75W-90 would cure all. I don't like bold claim either but don't knock it some how this stuff works, improvement was significant. Can't tell you how, but noise is much less and change is smoother. In my opinion $$ worth spent.
Perhaps this is a bit late, but I post for the benefit of those sill interested.
Here's the link (including fancy flash) http://www.xado.co.uk/xado_uk_atomic_gearbox_transmission_oil_75w90_gl.htm