yoooo so i have a 1991 xj6 sovereign and anytime i take my foot off the acceleration i hear a loud scraping sound in the rear of my car. it doesnt sound clunky so i know its not a broken piece inside the diff but ive been told its more than likely the diff. the sound seems to also occur during slight moments of acceleration. in an effort to stop it, i changed the diff fluid but no dice. any input???