1990 Eaton DS461P, Truck Tractor, Rear Rears (Tandem Rear or Single), Fits to: Western Star 4900, (Used) 1990 Western Star 4900, COMPLETE REAR DIFFERENTIAL GEARS ONLY- Make: Eaton, Model: DS461P, Ratio: 3.90, Capacity: 22,000 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 3.90, Serial# TBD, Truck Year 1990 2WKPDCCH5LK928008