View 0 Photos View 0 Videos 1998 Allison AT545 Transmission for a GMC C6500 $795 USD (USED) Allison AT545 Assembly#: 9108149778 Input Lgth: AUTOMATIC Input Dia: AUTOMATIC Pilot Dia: AUTOMATIC ConditionUsedAssembly Number9108149778Fits To Make(s)GMCFits To Model(s)C6500Stock Number26023450 MLS Number14455633CategoryTransmissions Last Updated6/28/2026 LocationSpencer, IA, US Sold ByVander Haag's Inc. (855) 370-___ SHOWNUMBERCall Seller Email Seller Save More Info