View 0 Photos View 0 Videos 2014 Eaton DSP40 Front Differential for a Peterbilt 579 $1,150 USD (USED) Eaton DSP40 Ratio: 3.42 Side Gear Splines: 41 W/ Locker: NO Cast#: 132038 ConditionUsedFits To Make(s)PeterbiltFits To Model(s)579Stock Number25996352 MLS Number14371284CategoryDifferentials, Front Last Updated9/10/2026 LocationDes Moines, IA, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info