How much does a 18 speed transmission weigh?

An 18-speed transmission typically weighs between 400 to 600 pounds (181 to 272 kg), depending on the specific design and materials used. The weight can vary based on factors such as the manufacturer, any additional components, and whether it includes features like an integrated retarder. This weight range is common for heavy-duty truck transmissions designed to handle the demands of high-torque applications.