2 0 Allison MT643 Transmission $1,500 USD Allison MT643. Locked up. S/N FZ3453, Core Charge: 0.00, Input Shaft: YES ConditionUsedFits To Make(s)AllisonFits To Model(s)MT643Part NumberFZ3453Stock Number144219 MLS Number12213913CategoryTransmissions Last Updated10/1/2025 LocationLouisville, KY, US Sold ByRiver City Truck Parts (855) 465-___ SHOWNUMBERCall Seller Email Seller Save More Info