Per some reports, as many as 90% of the semi-trucks being made today are fitted with automatic transmissions. That has, of course, not always been the case for long-haul vehicles.

The transmission in a semi-truck does a lot of heavy lifting, but how do they actually work? Here are all the types of transmission these heavy duty trucks use.

Per some reports, as many as 90% of the semi-trucks being made today are fitted with automatic transmissions. That has, of course, not always been the case for long-haul vehicles.