[oab_au]

RHD models that have the fuse, called DIFF LOCK. have a different AWD section to the US models, where the fuse is called FWD.

The system that the rest of the world have is a compound planetary gearset that provides a 36% front / 64% rear torque split. This is due to the number of teeth on the pinions and sun gears that provide that split.

The drive comes in to the front sun gear, the rear wheel drive is from the rear sun gear. The front drive is from the carrier, so the torque split is fixed by the gear ratio. A multi plate clutch is between the rear sun gear and the carrier to bring the torque back to 50/50.

The US system is different because, you can't turn one set of wheels off, in the RHD system, to run it on a two wheel dyno.
In the early 90s FWD dynos were not common in the US, so Subaru took the front wheel drive box, fitted the multi plate clutch to the back, to add torque to the rear wheels.

I would suspect that we will not get the 'binding' problems that the US have due to the different system and can't have the delay before the rear wheels engage, as they are all ways engaged.

So if you thought that yours behaved differently to the US one. Rest easy you were right.

Section drawing and write up, are in my locker.

Harvey.