ok guys while driving i hear a really bad clanking noise coming from the rear i drove for a little and then it got really bad the car then felt like it was just strugling to move so i got to a locale shop put the car on a lift and then turn the car on and put in first grear all you hear is alot clanking noise coming from inside the rear differential i guess it looks like time rebuild now any ideas as to what part to get and from where????!!!

