The noise you are hearing is coming from the rear differential. The name ‘differential’ is given because it can distribute different kinds of speeds to wheels especially during a turn.
With its many gears the teeth are entwined with each other. The effectiveness of the differential is dependent on how precise these gears are arranged and oriented to each other. If, for example, lubrication runs low on the mechanism or the arrangement of the gears goes out of place, rear differential noise occurs. Gear whine, bearing noise and clunking are common rear differential noises that are of concern and need to be checked out by a professional technician.
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