What is the difference between R gear and D gear?

[Cayden]

The differences between R gear and D gear are as follows: Different meanings: D stands for Drive, which is the driving gear used for normal road conditions. It automatically adjusts to a comfortable operating state based on road conditions and vehicle speed. R, on the other hand, is the genuine reverse gear. R is the abbreviation for Reverse, meaning backing up or turning around in Chinese. Its function is the same as the reverse gear in a manual transmission. Different usage frequencies: The frequency of using R gear is relatively lower compared to D gear. If R gear is placed at the very front or end of the gear positions, it is very easy to accidentally shift into R gear during blind operation. This not only damages the transmission but also increases the risk of scratching other vehicles due to incorrect gear selection during starting or parking, which is very unsafe. Therefore, placing R gear in the middle is the most reasonable design.

[LaHarper]

When I first got my driver's license, I was also confused about these gears. Simply put, the R gear is specifically for reversing, and you need to come to a complete stop before engaging it. For normal forward driving, you should shift to D gear, where the transmission automatically switches between gears 1 to 6 based on speed. The most dangerous situation is accidentally shifting to R gear while driving—my cousin did this once, causing the transmission to make a harsh grinding noise, and the repair cost over 5,000 yuan. When reversing, remember to press the gear shift lock button; the car body will slightly vibrate to remind you that you're in reverse gear. The parking sequence is also crucial: you must ensure the car is fully stopped before shifting gears; otherwise, the transmission gears can lock up, shortening their lifespan. I recommend that beginners practice switching between R and D gears in an open area to get a feel for it and develop the habit of checking the gear indicator on the dashboard.

[DelBeau]

From a mechanical principle perspective, gear differences lie in the power transmission methods. When in Drive (D) mode, the torque converter transmits power forward to the axle, while the planetary gear set automatically matches gears based on rotational speed. Shifting to Reverse (R) activates the reverse gear set, achieving power reversal through an intermediate idler gear. Transmission fluid pressure undergoes the most significant changes during this process, with R mode requiring higher pressure to establish reverse hydraulic circuits. All automatic transmission vehicles have anti-misoperation programs, such as locking R gear shifts when speed exceeds 5 km/h. When reversing, remember to check blind spots in rearview mirrors - some vehicles automatically activate rear cameras when shifted to R. Persistent incorrect operations can lead to valve body blockages; my neighbor's CVT transmission required major repairs for this exact reason.

[LeahLynn]

When driving in real situations, remember two golden rules: use D gear for moving forward and R gear for reversing. Always fully depress the brake before and after shifting gears, with the vehicle completely stationary as a prerequisite. When starting to reverse, gently release the brake to avoid sudden acceleration. Parking in slanted spaces like those in mall garages tests your skills the most; when frequently switching between D and R gears, it's best to activate the auto-hold function to reduce operational burden. Older models have longer gearshift lever throws, while newer electronic gear levers are much more convenient. When temporarily getting out to buy drinks, remember to shift to P gear first—I've seen several accidents caused by rolling cars otherwise. Pay extra attention to throttle control when reversing in rain or snow, and immediately shift to N gear if slipping occurs.