The weight of transmissions can vary widely depending on the type, size, and intended use of the transmission. For example, a manual transmission for a small car may weigh around 70-90 pounds (32-41 kilograms), while a heavy-duty automatic transmission for a large truck may weigh over 600 pounds (272 kilograms).Other factors that can affect the weight of a transmission include the materials used to construct it, the number of gears or speeds it has, and any additional features or components it includes. Overall, the weight of a transmission can be quite substantial, particularly in larger or more complex vehicles or machinery.