The differential between the axles controls the AWD on a 1996 2.2 Subaru Legacy Wagon.
viscous coupler
Nope. AWD was optional until 1998 when Subie decided to standardise their production.
The short answer is yes.
in the engine bay. Passenger side. Near the strut tower.
Head gaskets, head gaskets, head gaskets
You don't. Timing is adjusted totally automatically by your ECU.
it is for diagnostic and emergency use only
Put a fuse in the circuit labeled "FWD" under the hood on the passenger side.
I would bring it in, because you can never be sure
passenger side of firewall, near strut mount under the platic clip that reads FWD.
Subaru Legacy was created in 1989.