The term gearshift is really an anachronism, left over from a time when low-cost farm tractor motors were directly coupled to the drive wheels using variable gear sets. Because the tractor loads were high and the engines were weak, power dissipation was unnecessary. However, it was necessary for the framers to physically exchange gear sets to match the tractor speed to varying terrain or applications. This was done by stopping the tractor and unscrewing one gear set in order to replace it with another, known as 'shifting gears'. In recent times only one manufacturer has attempted to build a passenger vehicle with a true gear shift transmission.
In a vehicle with a gearshift transmission requires a torque free state to shift gears. The riding comfort is improved by a method of shifting gears where a gear shift is preceded by reducing the vehicle acceleration from an existing level to a first acceleration level, maintaining the vehicle acceleration at a reduced level for a predetermined time interval.
The gearshift transmission is said to put up to 20% more horsepower to the rear wheels. The engine is smooth, powerful, quick starting and fairly quiet.
Automatic Transmissions | Bevel Gear Drives | Combination Drives | Cycloidal Drives | Differential Gear Drives, Misc. | Dual Output Differential | Epicyclic/ Planetary Differential | Differentials, Tension Control | Differentials, Torque Control | Epicyclic Gear Drives | Harmonic Drives | Helical Gear Drives | Hypoid Gear Drives | Worm Drives | Tacho Drive | Marine Gear Drives | Miter Gear Drives | Spiral Bevel Gear Drives | Spur Gear Drives | Traction Drives | Variable Speed Drives | Manual Shift Transmission | Gear-Shift Transmissions