Brand: ATI Performance Products Manufacturer's Part Number: ATI405370 Part Type: Automatic Transmission Clutch Hubs Product Line: ATI Clutch Hubs Automotive Fittings Part Number: ATI-405370 UPC: 800157000836 Clutch Hub Position: High gear Clutch Hub Material: Steel Quantity: Sold individually. Description: Fully machined in-house, ATI clutch hubs replace stock cast iron units, which often break, causing total transmission failure. Available in zinc chromated stress-proof steel or hard-coated T-6 aluminum, these hubs are guaranteed against failure, whether you have a race car or a high performance street car.