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When the driver selects a gear, the dog clutch for that gear is engaged (via the gear selector rods), locking the transmission's output shaft to a particular gear set. This means the output shaft rotates at the same speed as the selected gear, thus determining the gear ratio of the transmission. [16]
Manual – the driver has to perform each gear change using a manually operated clutch; Automatic – once placed in drive (or any other 'automatic' selector position), it automatically selects the gear ratio dependent on engine speed and load; Basically there are two types of engine installation:
The term gear stick mostly refers to the shift lever of a manual transmission, while in an automatic transmission, a similar lever is known as a gear selector. A gear stick will normally be used to change gear whilst depressing the clutch pedal with the left foot to disengage the engine from the drivetrain and wheels .
Push-button gear selector in a 2010–2014 Mitsubishi Fuso Aero Star bus. Many transmissions also include positions to restrict the gear selection to the lower gears and engages the engine brake. These positions are often labelled "L" (low gear), "S" (second gear) or the number of the highest gear used in that position (eg 3, 2 or 1).
Gear selection also used hydraulics, however, the gear ratio needs to be manually selected by the driver. The 1956 Renault Dauphine 3-speed manual transmission was available with an optional Ferlec automated clutch, which used an electromagnetically-operated clutch system.
Packard's new Ultramatic model introduced in the middle of the 1954 model year was officially called Gear-Start Ultramatic Drive, offering a new selector sequence on the column shift: 'D', for Drive, placed in between High and Low, with High now represented by a simple dot (PN•DLR). In this new DRIVE range, it would use the low ratio and ...
Ford used the term "SelectShift" because in the first C4's, placing the gear selector in D2 forced the transmission to start in second gear and then shift to third gear. If the transmission was placed in D1, the transmission would start in first gear, then shift to second and third gear as normal.
The floor-mounted selector got an international P-R-N-D-2-1 lettering. Regime "1" now operated first gear only, via the rear band, whilst regime "2" locked out the first gear (like on the original GAZ-21 Volga). Gear ratios were now 2.35 – 1.0 for torque converter, 2.64 for first gear, 1.55 for second, third remained direct, and reverse ...