Fits GM/Chevy 4L80E 4L60E 4L65E Transmission Flex Plate 1999-2009 The flex plate bolts to the engine crank shaft and to the torque converter of your automatic transmission. When the engine starts and is running the flex plate turns, which turns the torque converter and powers your hydraulic pump in your transmission. Flexplate; Standard, with Spacer, 14.13" O.D., 168 Tooth, No Weight