6 0 Mack CRD151 Rear Axle Assembly for a 2018 Mack GU533 Contact for price (Used) 2018 Mack GU533, COMPLETE REAR REAR TANDEM- Part Number: 21387131, Serial Number: 9230023012, Make: Mack, Model: CRD151, Ratio: 5.04, Capacity: 23,000 Lbs, Hub Bolts: 10, Brake Type:... ConditionUsedRear End5.04 ratioFits To Make(s)MackFits To Model(s)GU533Will Fit Year(s)2018Part Number21387131Stock NumberP-99538 MLS Number13495683CategoryAxle Assemblies, Rear Last Updated4/3/2025 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info