It had been very first released in 1939 for vehicles. It includes the fluid coupling and a few planetary gears. They collectively make three ahead and a single reverse velocity. There's no clutch for engagement and disengagement with the engine. They've a big transmission charge and large bearing capacity. https://gearbox56666.develop-blog.com/40760678/how-much-you-need-to-expect-you-ll-pay-for-a-good-gearbox