1999 Meritor/Rockwell RS21-145, Truck Delivery, Axles, Complete Rears, Fits to: Ford F800, (Used) 1999 Ford F800, COMPLETE REAR DIFFERENTIAL- Part Number: R487A, Serial Number: AVA98117548, Make: Meritor/Rockwell, Model: RS21145NFNN553, Ratio: 4.33, Capacity: 23,000 Lbs, Hub Bolts: 10, Brake Type: Drum, 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 4.33, Serial# AVA98117548, Casting# AVA98117548 3FEXF8010XMA05007