2019 Meritor/Rockwell RS23-161, Truck Tractor, Rear Rears (Tandem Rear or Single), Fits to: Peterbilt 579, (Used) 2019 Peterbilt 579, COMPLETE DIFFERENTIAL GEARS ONLY- Part Number: C05-2A0401CHA10358, Serial Number: F0R05278769, Make: Meritor, Model: RS23-161, Ratio: 3.58, Capacity: 21,000 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 3.58, Serial# F0R05278769, Casting# F0R05278769 1XPBA77X1KD631058