View 9 Photos View 0 Videos Mack T310M Transmission Core for a 2012 Mack GU713 Newly Listed $3,499.99 USD (Core) 2011 Mack (MT), TRANSMISSION ASSEMBLY- Model: T310M, Serial Number: 5U1341, Part number: 281KB584, Engine: Mack MP7, The gear is Rusty!! Reference images for condition. For more... ConditionUsedEngine ModelMack MP7Fits To Make(s)MackFits To Model(s)GU713Will Fit Year(s)2012Part Number281KB584Stock NumberP-503494 MLS Number14426488CategoryTransmission Cores Last Updated6/13/2026 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info