View 0 Photos View 0 Videos 2021 Spicer S172 Rear Differential for a Peterbilt 337 Recently Updated $550 USD (USED) Spicer S172D Ratio: 5.25 Side Gear Splines: 41 W/ Locker: YES Cast#: 10049263 ConditionUsedFits To Make(s)PeterbiltFits To Model(s)337Stock Number25918806 MLS Number14067512CategoryDifferentials, Rear Last Updated1/10/2026 LocationSpencer, IA, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info