2016 Spicer/Dana Other, Truck Tractor, Complete Axle-Rear Rears, Fits to: Peterbilt 579, (Used) 2016 Peterbilt 579, COMPLETE REAR REAR TANDEM- Spicer® EconoTrek Tandem Axle. Front Drive Rear and Tag Rear no gears. Make: Spicer/Dana, Model: S20-045B, Serial Number: HN04227810, Part Number: 7051751, Ratio: 2.69, Hub Bolts: 10, Brake Type: Disk, Capacity: 20,000Lbs, 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 2.69, Serial# HN04227810, Casting# HN04227810 1XPBDP9X7GD298229