2017 Meritor/Rockwell RT40-145, Truck Tractor, Front Rears (Tandem Front), Fits to: Western Star 5700, (Used) 2017 Western Star 5700, FRONT DIFFERENTIAL GEARS ONLY- REMANUFACTURED- Part Number: S11-19633-342, Serial Number: FOR03892506, 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# FOR03892506, Casting# FOR03892506 5KJJBHD19HLJB6869