Between rear wheels. it is the rear axle housing. The diff is usually the round object in center that driveshaft attaches to with gears inside.
On the side of the transmission
Yes, it will fit and mount up just fine. But you will have to make sure the front differential gear ratio matches that of your rear differential. Or what you could do is swap the transmission from the Forester along with the rear differential from the Forester
On the 98 Beetle, the rear defroster fuse is located under the dash. It is found in the number eight slot.
it is attached to the rear differential. only sensor on it. reads the gear inside.
its on the top of the bellhowsing and on the differential case
R134a
It is on the top center of the rear axle.
Inside the transmission.
It is located on the rear valve cover to the rear of the alternator
Chain
On the bottom rear of the engine near the transmission.
There isnt a fuse on a 98 durango, there is a Relay under the hood for the Horn Relay