To counter this effect, some cars and trucks Use a torque converter with a lockup clutch. Once the two halves of the torque converter get on top of things, this clutch locks them collectively, making sure which the motor and gearbox spin at the identical speed and reducing energy decline. https://torqueconverterclutch64184.actoblog.com/34938793/5-simple-statements-about-torque-converter-clutch-explained