What is the difference between D gear and N gear?

[StZoe]

The difference between N gear and D gear lies in the higher fuel consumption caused by braking with gear engaged, while braking in neutral gear results in lower fuel consumption. The following are the related introductions about N gear and D gear braking: 1. N gear braking: When shifting to N gear and braking, the clutch between the torque converter turbine end and the planetary gear mechanism is disengaged. At this time, the engine drives the pump wheel to rotate, the pump wheel stirs the hydraulic oil, and then the hydraulic oil drives the turbine to rotate. Simply put, the engine idles with the torque converter, and the power cannot be transmitted to the planetary gear mechanism. 2. D gear braking: When shifting to D gear and braking, the engine still drives the pump wheel to rotate. At this time, the clutch between the turbine and the planetary gear mechanism is engaged. Because the vehicle is in a braking state and the drive axle is stationary, the planetary gear mechanism connected to the drive axle is also stationary; the torque converter turbine connected to the planetary gear mechanism is also stationary. At this time, the engine drives the pump wheel to rotate, but the turbine is held stationary. 3. Summary: When waiting at a red light, it is acceptable to shift to either N gear or D gear, as it will not cause damage to the vehicle. The difference lies in the higher fuel consumption caused by braking with gear engaged and the lower fuel consumption when braking in neutral gear. Therefore, from an economic perspective, shifting to N gear when braking is more reasonable than D gear.

[AutumnMarie]

When driving an automatic transmission car, I always feel a significant difference between the D and N gears. D stands for Drive; engaging it allows the car to move forward as the transmission connects the engine to the wheels, directly transferring power. This gear is suitable for normal driving, overtaking, or going up and down hills. On the other hand, N stands for Neutral; engaging it disconnects the engine from the wheels, allowing the car to coast freely while the engine idles without driving the car forward. At long red lights, I often shift to N and engage the handbrake to save fuel and reduce transmission stress. However, if I need to move suddenly, I must shift back to D. Some people mistakenly believe that coasting in N saves energy, but it can be dangerous at high speeds, potentially leading to loss of control or transmission damage. In summary, use D for daily driving, while N is suitable for short stops or during maintenance—don’t mix them up to avoid harming your car.

[OAubrey]

From the perspective of transmission operation, the D (Drive) gear locks the engine and wheels together, providing continuous power to move the car forward, resulting in smooth and responsive driving. The N (Neutral) gear acts as a disconnection point where the engine keeps running but the wheels are disengaged, similar to coasting on a bicycle with freewheeling. During long drives, I occasionally use N gear for brief stops to rest, like when queuing in a drive-thru—just never shift to N while the car is moving, as it would cut off propulsion and create a tricky situation. Additionally, N gear is mandatory during car washes or towing to prevent mechanical damage. Honestly, it's easy to remember once you get used to it: use D whenever the car needs to move, and N when the car stays stationary but the engine remains on.

[MacJuniper]

D mode allows for smooth acceleration and complete power transmission; N mode is purely idling, with the engine not driving the car. The difference is obvious: in D mode the car moves, in N mode it stops or coasts. I suggest new drivers practice more to feel the difference, such as starting the car in N mode to see it doesn't move, then switching to D mode and gently pressing the accelerator to go. The key is not to use N mode while moving to avoid accidents. Remember this, and driving will be much safer.