(Used) 2007 Mack CXN613, FRONT DIFFERENTIAL GEARS- Make: Meritor, Model: RT40-145, Ratio: 3.37, Capacity: 20,000 Lbs, Part Number: C3121R2280, Serial Number: AVH06012357, For more information about this item, give us a call.We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921