We love our Patrols. There are lots of them around Australia (easy to find parts) and they have the strongest driveline. They are the base of many off-road racing builds.
In 2000 Nissan put a 3l motor in most of them up to 2006.5 and 90% of patrols got a newer version of the 3 liter but was very under powered and started to have real problem's at around 350 000km.
So the V8 Duramax is a easy fit into the engine bay, well kind of.