2017 Spicer/Dana DSP40, Truck Tractor, Complete Axle-Front Rears, Fits to: Peterbilt 579, (Used) 2017 Peterbilt 579, COMPLETE FRONT REAR TANDEM- Part Number: C1-1A43FA3000000001, Serial Number: HN05045033, Make: Spicer, Model: DSP40, Ratio: 3.36, Capacity: 20,000 Lbs, Hub Bolts: 10, Brake Type: Drum, 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 3.36, Serial# HN05045033, Casting# HN05045033 1XPBDP9X2HD420738