1999 Meritor/Rockwell RS23-160, Truck Delivery, Rear Rears (Tandem Rear or Single), Fits to: International F-2574, (Used) 1999 International F-2574, REAR DIFFERENTIAL GEARS ONLY- Part Number: 3509911C91, Serial Number: AVA99082712, Make: Meritor, Model: RS23-160, Ratio: 4.89, Capacity: 23,000 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 4.89, Serial# AVA99082712, Casting# AVA99082712 1HTGGAXT3XH213328