Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4CR3971 found under Cup by Allard Nazarian Group Inc. The National Stock Number assigned to this part is 3010004106040, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4CR3971.