The tremendous shock loads generated at launch by most any drag racing vehicle equipped with todays sticky tire compounds or the acceleration and deceleration of oval track cars puts considerable strain on the ring gear. For this reason, the fastener exerts at ARP have developed the Pro Series of ring gear bolts. They're forged from premium grade 8740 chrome-moly steel and are heat treated to a nominal rating of 200,000 psi. tensile strength. Specially hardened, precicion ground washers are included where required. Available to fit almost any ring gear setup ranging from the popular Ford 9" & GM 10 Bolt and 12 bolt Rearends to the beefy Strange differentials found in Top Fuel cars.