View 6 Photos View 0 Videos Dana RSP40 Rear Axle Assembly for a 2004 Peterbilt 385 Contact for price (Used) 2004 Peterbilt 385, COMPLETE REAR REAR TANDEM- Part Number: 511331, Serial Number: HN01016128, Make: Spicer, Model: RSP40, Ratio: 3.90, Capacity: 18,000 Lbs, Hub Bolts: 10, Brake Type... ConditionUsedRear End3.90 ratioFits To Make(s)PeterbiltFits To Model(s)385Will Fit Year(s)2004Part Number511331Stock NumberP-503055 MLS Number14372847CategoryAxle Assemblies, Rear Last Updated5/15/2026 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info