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Old 12-25-2012, 02:34 PM
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What kind of car is it? What differential is in it?

Most of the time the bearings will cause the noise. It can be a pinion or differential bearing. Maybe cars in England have problems with the heat treatment of the gears, or maybe the metal is bad, but the gears are usually not the cause here. If a gear is bad it usually shows up as soon as the gears are installed.
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