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  1. I have a 2002 Subaru Outback with manual transmission. After driving the car for 30 minutes, a very loud whirring/humming noise starts (no noise or very very little the first 30 minutes). It get's louder with higher speeds, but is still very annoying at low speeds after the 30 min mark. When stopped, there is no noise at all. I took the car to a mechanic and he thought it might be a wheel bearing, but he checked them all and said they were fine. Based on reading past posts, I thought it might be one of the differentials. Based on what I read, I checked if my wheels clunk when making slow, tight turns and there is clunking after driving for at least 30 min but turns smoothly when the car is first started. Is there a way to check how the front and rear differentials are doing? If the fluid levels are ok, are the diffs ok? Thanks