View 4 Photos View 0 Videos Dana-Spicer S21-172D Rear Differential for a 2019 Peterbilt 337 Recently Updated $849.97 USD (Used) 2019 Peterbilt 337, COMPLETE DIFFERENTIAL HOUSING ONLY- Part Number: 10049264, Serial Number: HN07649680, Make: Spicer, Model: S21-172D, Ratio: 5.38, Capacity: 20,000 Lbs, For more... ConditionUsedRear End5.38 ratioFits To Make(s)PeterbiltFits To Model(s)337Will Fit Year(s)2019Part Number10049264Stock NumberP-74178 MLS Number12674538CategoryDifferentials, Rear Last Updated3/12/2026 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info