Does anyone how what different gearsets there are for the Rs Turbo BC Boxes?

Mines at CTS having an end casing swap for my ARB and the very helpful chap phoned me and said its got a close ratio gearset in it?

I didn't know there was one?

He said he would happily swap it for a standard gearset as they are hard to come across and useful for 1/4 mile boxes to them, and would probably annoy me as it will be loud (semi straight cut maybe?) and have no pull at top speeds, but apart form that didn't tell me much more.


Does anyone know any more about them?