Pathfinder (model years?)(Edit)
All Mode selectable all wheel drive system - normally rear wheel drive, in AUTO mode front axle engages when rear wheels start to slip, power is variably distributed from 0:100 to 50:50 front to rear. In AUTO mode the system works as an automatic all wheel drive system. In 2WD mode, the clutch is unlocked permanently. In 4H mode the tranfer clutch is permanently locked - power distribution 50:50.
Figure: All Mode all wheel drive system modes and scheme.
Patrol 160, GR Y60 ...-1998, Y61 1998-..., PickUp 1998-...(Edit)
Part-time all wheel drive. LSD rear - standard, Locking differential - optional. 2,02:1 low gear.
Figure: Nissan Patrol GR transfer case
Skyline GT-R R33 (model years?)(Edit)
Mechanical rear wheel drive with a clutch to transfer power to the front differential. Torque-vectoring rear differential.
"The clever electronic control system is fed by all the information ... such as G-force, boost pressure, throttle position etc, in addition, the speed of individual wheels measured by ABS wheel speed sensors. By these information, the computer knows whether the car is running out of cornering limit or not. If not yet, the multi-plate clutches won't intervene, thus the car can power slide through the corner smoothly. In case out of limit, the multi-plate clutch will engage and send torque to front wheels, increasing traction."
http://www.autozine.org/technical_school/traction/tech_traction_4wd_21.htm#Skyline
X-Trail(Edit)
All Mode selectable all wheel drive system - normally front
wheel drive vehicle, in AUTO mode rear axle engages when front wheels start to slip, power is variably distributed from 100:0 to 50:50 front to rear. In AUTO mode the system works as an automatic all wheel drive system.
In 2WD mode, the clutch is unlocked permanently. However, even when in 2WD mode, front wheels can sometimes be engaged by electronic control unit, for example under heavy acceleration.
In LOCK mode the tranfer clutch is permanently locked - power distribution 50:50. If vehicle speed increases, the vehicle automatically goes to AUTO mode, then, when speed decreases, it switches back to LOCK. When transfer clutch oil is overheated, the vehicle goes into 2WD mode.
Figure: Nissan X-Trail All Mode 4wd system description
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