2015 Detroit RT40-4N, Truck Tractor, Rear Rears (Tandem Rear or Single), Fits to: Freightliner Cascadia 125, (Used) 2015 Freightliner Cascadia 125, REAR DIFFERENTIAL GEARS ONLY- Part Number: C11-00006-976, Serial Number: 771AAC-A151452T, Make: Detroit, Model: RT40-4N, Ratio: 3.31, 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 3.31, Serial# 771AAC-A151452T, Casting# 771AAC-A151452T 1FUJGLD68FLGU4378