Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6773145 found under Transmission Assemb by Allison Transmission Holdings Inc. The National Stock Number assigned to this part is 2520002362948, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6773145.