My 2000 Subaru Forester has a noise comming from the rear of the car. The noise seem to be the same regardless whether I am excelling, decelling or coasting. Yesterday while traveling on the Turnpike at about 70 mph the drive train slipped, the rpms went up to about 5,000 and the car lost speed. As long as I keep it under 60 mph it runs OK.
Is your Forester equipped with an automatic transmission, or is it manual?
It could have something to do with the center differential in either case, but then again, it could have something to do with your clutch if it is manual, or the transmission if it is automatic. Which transmission does it have?
Automatic transmission
The rear differential and one wheel bearing went bad on our 1998 Legacy. Together, they made a continuous growl whose pitch and volume were proportional to road speed.
The problem on the turnpike sounds like the transmission, itself.