when do you use overdrive on a truck
Overdrive (mechanics) Generally speaking, overdrive is the highest gear in the transmission. Overdrive allows the engine to operate at a lower RPM for a given road speed. This allows the vehicle to achieve better fuel efficiency, and often quieter operation on the highway. When it is switched on, an automatic transmission can shift into overdrive mode after a certain speed is reached (usually 70+ km/h [40-45 mph or more] depending on the load). When it is off, the automatic transmission shifting is limited to the lower gears. Overdrive should usually be selected when the average speed is above 70 km/h (40-45 mph).
Pickup truck A regular cab has a single row of seats and a single set of doors, one on each side. Extended or super cab pickups add an extra space behind the main seat, sometimes including small seats. The first extended cab truck in the U.S. was called the Club Cab and introduced by Chrysler in 1973 on Dodge trucks. A crew cab, or double cab, seats five or six and has two full-size front-hinged doors on both sides. The first crew cab truck in the U.S. was made by International Harvester in 1957 and was later followed by Dodge in 1963, Ford in 1965 and Chevrolet in 1973.