95 e320 prolonged shift from 2nd to 3rd

what could cause a '95 e320 to have prolonged shift from 2nd to 3rd gear under normal eccelaration. by prolonged i mean it takes more time to shift 2nd to 3rd than it takes from 1 to 2 or 3 to 4.
thanks
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I would say it is time to have your tranny fluid and filter changed... possibly you got some sticking valves in the valve body of the tranny.
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