View 4 Photos View 0 Videos Meritor-Rockwell RD20145NCN5211 321 Rear Differential for a 2012 Peterbilt 384 Recently Updated $849.98 USD (Used) 2012 Peterbilt 384, COMPLETE REAR DIFFERENTIAL GEARS ONLY- Part Number: C05-210201G3E10321, Serial Number: FOR01559793, Make: Meritor/Rockwell, Model: RD20145NCN5211 321, Ratio: 3.21,... ConditionUsedRear End3.21 ratioFits To Make(s)PeterbiltFits To Model(s)384Will Fit Year(s)2012Part NumberC05-210201G3E10321Stock NumberP-54228 MLS Number12197223CategoryDifferentials, Rear Last Updated3/12/2026 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info