i have the same problem on my 98. It sounds to me like the viscous clutch pack is sticking. Try driving around in figure 8's for about 15 minutes and see if that helps and if there is snow were you are do some power donuts in both directions and it should loosen up.Subaru said that you can jack up one side of the vehicle so that both wheels are off the ground and then block the other wheels, put in drive and then bring it up to 1500 rpm for about 8 minutes and that should loosen it up aswell but it doesnt sound very safe to me so i havent tried that yet but if you do and it works please post it thx and i hope that is your problem. If not it could be a wheel bearing or an axle.
A lot of times the grinding sound that is heard when going over bumps is actually the car scraping the cement. If it is not a serious problem then the best thing to do would be to drive slow over the bumps.
earths plates scraping each other
Brakes
Usually rubbing on kerbs when you park too close.
It seems as if your car is low on or out of motor oil. Having an oil change done should solve the problem.
grinding #
It may me that your brake is on.
it is the creation of new landforms
Glacial grooves are caused by the ice picking up boulders and scraping them across the bedrock.
wheel bearing?
Typically its wheel barrings but can also be bad rotors.
Bearings, cv shaft, or brakes.