View 0 Photos View 0 Videos 1999 Allison AT545 Transmission for a GMC T6500 Newly Listed $1,085 USD (USED) Allison AT545 Assembly#: 29519304 Input Lgth: AUTOMATIC Input Dia: AUTOMATIC Pilot Dia: AUTOMATIC ConditionUsedAssembly Number29519304Fits To Make(s)GMCFits To Model(s)T6500Stock Number25919724 MLS Number14104189CategoryTransmissions Last Updated1/22/2026 LocationSpencer, IA, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info