Using the Request for Quote (RFQ) form provided on this page, you can request competitive procurement options on part number 121SHA40 with rapid responses always offered by our staff. To ensure that you locate and procure exactly what you need with ease, we list parts with as much information as we can. For example, part number 121SHA40 It is listed as Gear Cluster. component manufactured by Mack Trucks Inc Parts Opn, specifically under CAGE Code 76040. It is also accompanied by the NSN 3020004966755 for ease of organization, the first digits of the NSN indicating that the part belongs to FSC 3020 Gears Pulleys Sprockets and Transmission Chain.