3 0 2014 Eaton RS404 Rear Differential for a Peterbilt 579 $375 USD (USED) Eaton RS404 Ratio: 3.08 Side Gear Splines: 41 W/ Locker: NO Cast#: NF DI 21H3 1 ConditionUsedFits To Make(s)PeterbiltFits To Model(s)579Stock Number25487339 MLS Number12338419CategoryDifferentials, Rear Last Updated11/8/2025 LocationSpencer, IA, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info