Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RA57 4 78 found under Differential Driving Axle by Barney And White Auto Parts Inc. The National Stock Number assigned to this part is 2520013055671, 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 RA57 4 78.