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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?

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.