(Used) 1992 Mack DM688S, REAR DIFFERENTIAL GEARS ONLY- Make: Mack, Model: CRD93, Ratio: 4.64, Capacity: 22,000 Lbs, 19QF4409-P3, 19105063, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921