Extra Heavy-Duty Shaft That Will Provide The Necessary ReliabilityMade From ARP2000 And Heat Treated To 220,000 PSICNC Milled (Not Broached) Hex, And Has The Retaining Washer InstalledFord 289-302 Boss 302 oil pump drive shaft• Made from premium grade 8740 chrome-moly steel• Rated to 190,000 psi tensile strength• Alignment sleeve roll formed, not welded or pinned