Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8638920 found under Parts Kit Hydraulic by General Motors Corp. The National Stock Number assigned to this part is 2520012486366, 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 8638920.