To counter this effect, some cars and trucks have a torque converter which has a lockup clutch. Once the two halves in the torque converter get up to speed, this clutch locks them together, guaranteeing which the engine and gearbox spin at the exact same speed and reducing energy decline. https://torque-converter-clutch08528.webdesign96.com/34735580/the-2-minute-rule-for-torque-converter-clutch