JEGS Crankshaft Spacer is used when swapping to an automatic transmission built before 1997 with the appropriate torque converter. The LS small block crankshaft flange is shorter in relationship to the end of the bellhousing flange, which creates a gap between the crankshaft and torque converter when the bellhousing is bolted to the block, thus requiring a flexplate spacer adapter. . Make the swap a breeze with JEGS Easy Kit designed by the experts at JEGS to ensure quick and easy installation.