Can you identify this GQ Diff?

Hi,
I found this rear diff in my new GQ, :D
Plate says its HG41, But i think previous owner swaped rear diff.
Can you identify it?
Ps: I'm new to Patrols.
Attachment 57845
Attachment 57846
Attachment 57847
Attachment 57848
Attachment 57849

The 41 indicates the ratio is 1:4.1 looks like a standard Nissan diff to me

Take a pic of the compliance plate under the bonnet and post it up mate.

With that disc on the side of the housing with the hoses linked to it, would suggest the factory vacuum operated diff lock. Same as mine.
You should have a switch in the cab somewhere saying diff lock. Mine is down bellow next to cig lighter. Not sure where in the GQ though.

Here is my plate. But something is hidden ;)
Attachment 61305

Yes. some vacuum lines are there and two wires are hanging up from the diff. Couldn't find any connector near by to plug in :D
I have small selector for diff lock on - off, next to DVD player. I found the solenoids for vacuum control.
Currently I'm doing a mod in fuel system. Next will be sorting out diff lock.