This is a low gear that fits a 3-speed transmission. Fits 1963 Fairlane 289 engine, Ford 352-390engines , Mercury 390 engine. The number for the part is: 288-12. It was remanufactured and has been in storage for several years. It was remanufactured by the SOSMetal Company. New old stock. If you have any questions, call Bill at (606)269-4906.