2016 Meritor/Rockwell RT40-145, Truck Tractor, Rear Rears (Tandem Rear or Single), Fits to: Mack CXU613, (Used) 2016 Mack CXU613, REAR DIFFERENTIAL GEARS ONLY- Make: Meritor, Model: RT40-145, Ratio: 3.42, Capacity: 20,000 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, Ratio 3.42, Serial# TBD, Truck Year 2016 1M1AW07Y4GM011374