(Used) 1985 Mack RS686LST, REAR DIFFERENTIAL HOUSING ONLY- Part Number: 11KHA5312P15, Make: Mack, Model: 11KHA, Ratio: 3.87, Capacity: 17,000 lbs, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921