It will have to shift from the fourth to the third gear when you need an extra jump. Driving Tips. Maintenance Tips. Car Review. Car Comparison. Industry knowledge. By Matsumoto Naoki. Last updated Feb 18, What Is D3 Gear?
D3 works like downshifting in a stick shift. Driving Uphill Or In the Snow The gear also comes handy when you are climbing a hill or driving on a slippery surface. For Faster Acceleration Many people think that they cannot accelerate quickly when engaged in the D3 gear.
Hauling Load When you are towing a trailer or another vehicle, you have to carefully control the speed. Use D3 when you are driving in the city. Why would I want to do this? What is it good for? Does it make my fuel efficiency better or worse? Does it make the transmission's job easier or wear it out faster? This is analagous to down shifting in a manual. This is a lower gear for the transmission which means the engine revolves at a higher rate producing more back pressure at the same speed as a higher gear.
When going down a hill, if you downshift that will reduce the demands on the braking system, due to the back pressure. You will often see truck drivers downshifting on long hills so that their brakes do not overheat. You would only use D3 while going downhill with a load so you can use your brakes less.
Your mileage would be worse since the engine is running at a higher rpm. Only if you did a lot of using D3 would it make any appreciable wear on your transmission. In addition to what Patrick said, D3, or whatever else it's called in various makes and models, is also useful for those times when you're climbing a hill and the transmission keeps shifting back and forth between gears. There may also be times, such as when driving on very slippery surfaces, when a gear shift could cause the car to lose traction.
In such a situation the ability to hold the car in a given gear can be very advantageous. Worked mint for me still very economical and I have owned 3 Accords :D. I use D3 in snowy conditions and climbing hills. In the winter, it helps prevent slippage from gear shifts. You can't slow down in the snow on a hill or you will get stuck. Back pressure on a downhill will be greater - especially if the auto has overdrive, this should prevent the shift to overdrive.
See other posts for reasons to prevent shifting. We hope this article well explained what D1, D2, and D3 do in an automatic transmission. Stay tuned for more driving skills on Naijauto. Hassana Obi. Car prices. Hassana Obi is an automobile writer and editor at Naijauto. She prides herself on hundreds of informative and entertaining articles on Nigerian traffic regulations, car prices and celebrity car collections. When Hassana is not writing, she is a teacher and philanthropist.
Sell my car. This is useful especially when towing a trailer or another car since you have to control your speed. You can also use this during heavy rainfall where slowing down is highly recommended. You can use this to downshift or upshift manually in certain situations without getting out of the automatic transmission capability. These are the most common modes you could see in cars today. With proper use of these driving modes, you will be able to maximize the use of your car even when it has an automatic transmission.
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