This is old sure but it needs clearing up. The Nissan terrano gearbox is a Part time 4wd system like the Navara's, Pathfinder, Patrol. They have a big transfer case hanging off the rear of the gearbox.
There is no way in hell you will get the Navara, Pathfinder, Terrano gearbox into a U12. The closest thing you could possibly get to work would be a Nissan Xtrail gearbox. East west layout but it still a part time 4wd system.