Why do many heavy duty vehicles use manual transmission?

Question

Why do many vehicles used for heavy work, like trucks, bulldozers etc. use manual transmission instead of auto?

In: 23

Answer 1

Manual transmissions are more durable, tougher and easier to repair than automatic transmissions. The durability allows them to last a long time-a million miles for our trucks. Because they are simpler, there are fewer moving parts so those parts can be larger (for a same sized housing) to handle more torque and break down less.

In addition, you can use manual transmissions as an engine brake and “lock” the gearing for long descents. Engine braking reduces brake overheating, fade and allows the operator to keep the 80ton vehicle safely under control.