2002 Ford Taurus REAR END JARRING

I RECENTLY HAD BOTH REAR END SPRINGS REPLACED SINCE ONE OF THEM WAS BROKEN. I NOW NOTICE THAT WHEN I GO OVER EVEN SMALL BUMPS, I FEEL AND HEAR THIS JARRING JOLT IN THE CARS REAR END. THE REAR END SEEMS KIND OF HIGH BUT I SUPPOSE THAT IS BECAUSE OF THE NEW SPRINGS.