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What gear should an automatic transmission car use when going down a long slope?

2 Answers

MichaelAnn

07/28/25 9:17pm

For cars with a manual-automatic transmission, shift into D+ or D2 gear for descending slopes. For purely automatic cars, shift into L1 or L2 gear for descending slopes. This is because engaging a lower gear keeps the car's transmission output at a lower speed, which effectively ensures safe descent and reduces wear or damage to the car's braking system. Precautions for driving downhill: Slow down when descending: Before descending, the vehicle should slow down in advance and shift into a lower gear when entering the downhill section. This ensures safe driving on the downhill section, reduces the frequency of using the brakes, and avoids overheating and failure of the braking system. Do not coast in neutral: When driving downhill, never coast in neutral. Always use an appropriate gear to utilize the engine's braking effect to reduce the vehicle's speed. Coasting in neutral can cause the vehicle to speed up, increase the burden on the braking system, and may lead to brake failure. Maintain a safe distance from the vehicle ahead: When driving downhill, always keep a safe distance from the vehicle in front. If the distance is too close and the vehicle ahead encounters an emergency, there may not be enough time to take emergency measures due to insufficient safety distance.

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WyattDella

08/12/25 1:56am

When driving downhill, I always shift to a lower gear, such as L gear or manual mode's 2nd or 3rd gear. The reason is simple: using only D gear on steep slopes causes the car to accelerate continuously, requiring constant braking, which can easily overheat or even fail the brake pads. If the brakes fail, it would be dangerous. After shifting to a lower gear, the engine helps decelerate, making it feel like the car is slowing itself down, and the speed is much more stable. I drive on mountain roads often and always shift gears in advance to prevent accidents. This engine braking also protects the brake system and extends its lifespan. Developing this habit makes driving more reassuring, especially during long trips when I check the navigation route in advance to anticipate the length of the slope.

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