View 0 Photos View 0 Videos 2005 Eaton-Spicer Rear Differential for a Peterbilt 387 $600 USD 180823-821 - Used Rear Rear Differential from a 2005 Peterbilt 387, Make - Eaton, Model - RSP40, Ratio - 3.36, This unit has been inspected and is being offered with warranty ConditionUsedRear End3.36 ratioFits To Make(s)PETERBILTFits To Model(s)387Stock Number2234528 MLS Number12007867CategoryDifferentials, Rear Last Updated6/16/2026 LocationSpokane Valley, WA, US Sold ByLKQ Heavy Truck (855) 905-___ SHOWNUMBERCall Seller Email Seller Save More Info