2018 Detroit DA-RT-40.0-4, Truck Tractor, Complete Axle-Rear Rears, Fits to: Western Star 5700, (Used) 2018 Western Star 5700, COMPLETE REAR REAR TANDEM- Part Number: QA6813504750, Serial Number: FZ 227073, Make: Detroit, Model: DA-RT-40.0-4, Ratio: 3.08, Capacity: 20,000 Lbs, Hub Bolts: 10, Brake Type: Disk, 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 3.08, Serial# FZ 227073, Casting# FZ 227073 5KJJBHDR1JLJN8386