View 5 Photos View 0 Videos Allison HD4560P Transmission Control Module (TCM) for a 2004 Mack MR688S Contact for price (Used) 2003 Allison HD4560P, TRANSMISION ECM- Model Number: WT3ECU911A, Serial Number: 1A008332, Part Number: 29541227, Transmission information- Model: HD4560P, Serial Number: 6610121380, 3... ConditionUsedEngine ModelCummins ISMFits To Make(s)MackFits To Model(s)MR688SWill Fit Year(s)2004Part Number29541227Stock NumberP-80981 MLS Number12893061CategoryTransmission Control Modules (TCM) Last Updated5/13/2026 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info