parallel shaft high speed gearbox are almost non-synchronous. An argument is to synchronize the increased weight with the payload that is one thing that fails, and the driver driving takes thousands of hours so that there is enough time to learn to drive the non-synchronized transmission efficiency. Paper mill gearbox often in urban traffic, such as cement mixers, gear reducers need to transfer very frequently, in the stop and traffic caught in a mess. Because very few heavy-duty transmission synchronizers have automatic transmissions, rather than commonly used, despite their increased weight, cost and efficiency losses.
Heavy duty trucks are commonly used for diesel engines. From the 20th century, 70's diesel truck engines and early tend to have a narrow power band, so many of the near-space gears were needed. With 1968 Maxidyne, the diesel truck engine turbocharger began to increasingly use and expand the power with electronic control, making less and less gear ratio. A smaller proportion of transmission is lighter and can be more effectively reduced due to serial transmission. Few transitions also make more of a truckable truck. As of 2005, fleet operators often used 9,10,13 or 18 speed gearboxes, but automatic manual and semi-automatic transmissions are becoming more common for heavy vehicles because they can improve efficiency and driving performance, gear reducer to reduce into the market The new barriers to the driver, and can improve the safety of the road conditions for the driver to concentrate.
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