2 0 Eaton DSP40 Rear Differential for a 2003 Peterbilt 379 $795 USD RSP40 3.55 GOOD INSPECTED TAKEOUT 90 DAY WARRANTY EXCHANGE, Axle Spline Count: 41, Serial#: NA, Core Charge: 350.00, Ratio: 3.55 ConditionUsedFits To Make(s)PeterbiltFits To Model(s)379Will Fit Year(s)2003Part NumberRSPStock Number81524-3 MLS Number13083833CategoryDifferentials, Rear Last Updated5/13/2025 LocationUcon, ID, US Sold ByHolst Truck Parts (833) 541-___ SHOWNUMBERCall Seller Email Seller Save More Info