How many total hours of labor?
I agree a good Stang shop can have that rear end out in no time and the new one slapped in! Was the ring and pinion already installed in the housing? If you said "They installed a New Set of Aluminum Heads too!" I'd say good deal! someone suggested 20 hrs of labor for that work? If I owned a shop and it took my mechanics that long I'd be looking for new employees!! let's seeSeems a little expensive without any head work IMO.