General Motors Powerglide, TH350 TH400 with race converter, 1/2 thick tabs, 1.250 Under Head Length, 7/16-20 Thread Size, Pro Series ARP Torque Converter Bolts 230-7303With ARP Torque Converter Bolts You can forget about the problem of shearing a torque converter bolt after you install these super strong 200,000 psi gems.They are designed for each specific application and provide the optimum grip. Kits come with hardened parallel-ground washers.