Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17T1979 found under Shaft Shouldered by Mack Trucks Inc. The National Stock Number assigned to this part is 3040009777412, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 17T1979.