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In some vehicles, switching the lever from D to the highest number means locking out the two highest gears, not one: Some automatic cars have a push-button on their gear levers or dashboards marked “O/D off” that locks out the overdrive gear, which historically has been the single topmost gear. Only a 1 position, if provided, would truly hold this type of automatic in a single gear ratio. What for? When driving in the mountains, a lower gear provides more engine braking and keeps the transmission from shifting as often, which can overheat it.
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Rather, each number simply represented the highest gear to which the transmission would shift automatically with the lever in that position.įor example, in a four-speed, selecting 3 would allow the automatic transmission to shift among 1st gear, 2nd gear and 3rd gear, but 4th gear would be locked out, accessible only by selecting Drive.
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GEAR SHIFT DRIVER
Though there have been exceptions, the numbers rarely meant the automatic gearbox would serve as a manual whereby the driver could shift into, say, 2nd gear and the transmission would refuse to shift up or down. Modern cars typically have just an L or S at the end of their PRND, but there was a time when automatic cars and trucks commonly followed Drive with 321 or even 4321. There’s also the mention of S, which could be a Sport setting in which the transmission behaves similarly, downshifting sooner when you open the throttle to pass and holding lower gears longer for sustained acceleration. In some cases, what you’re selecting is essentially a mode, like Drive, that allows the automatic transmission to do its own thing, shifting from one gear to the next, but within certain parameters: A Low (L) setting typically holds the transmission in lower gears than Drive for given speeds - as you’d want for providing engine braking to descend steep hills - but nowadays, it doesn’t limit the transmission to one gear. Most automatic transmissions also allow you to select one or more positions past the PRND options. Related: Do You Really Need to Change the Transmission Fluid?ĭrive, of course, covers all the forward gears - and because an automatic transmission selects those gears automatically based on throttle position, vehicle speed and other factors, Drive is the only transmission position most people select for forward progress. Furthermore, low gear driving can be beneficial when descending a hill since you won't have to brake as hard.Q: What do the numbers and letters mean on an automatic transmission: 1, 2, D, L, S, etc?Ī: That’s what’s known in the automotive world as the “prindle,” the pronunciation that engineers bestowed on the transmission gear selector because it commonly contained the letters PRNDL for Park, Reverse, Neutral, Drive and Low. Steep inclines can be difficult to surmount without putting too much stress on your engine if you don't shift to low gear. Driving up and down hills, like when traveling through the mountains.When you shift to a low gear, your car will always drive more slowly and with more power, which can help your wheels grip the road under slippery conditions and prevent you from spinning out of control. Note that you should always consult your car’s owner’s manual before using low gear since it will indicate a maximum safe speed that you shouldn’t cross. Remember, low gear provides additional pulling or pushing power to your car. You need to tow trailers, vehicles, or boats.For example, low gear can be beneficial when: There are some situations where you might need to use your lowest gear and take advantage of the additional torque it provides your wheels.
GEAR SHIFT DRIVERS
While an automatic transmission may shift you back down and above low gear without your input, some cars allow their drivers to shift into low gear manually. When Should You Use the “Low” Setting on Your Gearshift?