4 0 2016 Spicer S23-190D Rear Differential for a Peterbilt 579 $375 USD (USED) Spicer S23-190D Ratio: 2.69 Side Gear Splines: 46 W/ Locker: YES Cast#: 09F15 ConditionUsedFits To Make(s)PeterbiltFits To Model(s)579Stock Number25786694 MLS Number13538948CategoryDifferentials, Rear Last Updated5/4/2025 LocationKansas City, MO, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info