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I have a 2002 Subaru Legacy with turbo. When accelerating on flat surface at about 80km/hour there is a high frequency vibration, this also happens at lower speeds going up hill when the car has passengers. I have recently had the car serviced and had the differential checked as someone advised me that was the problem. what else should be checked out?
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If the differentials are ok then you need to get a mechanic to dig a bit deeper and locate the cause of the vibration. It could possibly even be a worn cv joint, unbalanced propshaft or a damaged rubber mounting. A good mechanic shouldn't have a problem locating the fault.