2007 Mack CRD203, Truck Tractor, Rear Rears (Tandem Rear or Single), Fits to: Mack CHN613, (Used) 2007 Mack CHN613, REAR DIFFERENTIAL GEARS ONLY- Part Number: 64KH5105, Make: Mack, Model: CRD203, Ratio: 3.94, 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 3.94, Serial# MKC06073478, Casting# MKC06073478 1M1AJ07Y67N010591