What is the appropriate speed for shifting from 4th gear to 3rd gear?

[StephenMarie]

When downshifting from 4th gear to 3rd gear, the speed should be reduced to around 30 km/h. Here's an introduction to the gears: 1st gear: It's a buffer gear. After a smooth start, slightly press the accelerator and then shift to 2nd gear. During a test, this must be completed within 50 meters. 2nd gear: Shift to 3rd gear when the speed exceeds 20 mph. During a test, this must be completed within 150 meters. 3rd gear: Commonly used in daily driving, suitable for speeds above 20 mph and below 40 mph. Shift to 4th gear when the speed reaches 40 mph. 4th gear: During a test, shift to 4th gear when there are no people or cars around, and the speed should not exceed 60 mph. 5th gear: Used for high-speed driving. At this time, safety should be prioritized, generally for speeds above 60 mph.

[MartinAnn]

After driving manual for so many years, I feel that downshifting from 4th to 3rd mainly depends on the engine's condition. When normally driving around 70 km/h and wanting to overtake, dropping to 3rd gear just right pulls the RPM up to 3000, delivering quick power without hurting the clutch. When struggling uphill, downshift earlier—shifting at 40 km/h isn’t too late, or else the engine wheezes like it’s about to give out. The key is listening to the engine sound, not staring at the speedometer. If it sounds muffled, it’s time to downshift. That’s how I judged it in my old Corolla—the moment you shift, the acceleration kicks in instantly. But don’t recklessly downshift on a downhill; forcing 3rd gear at high speed risks grinding the gears.

[McLondyn]

My buddies in the tuning scene often tease me for being too conservative, but there's no fixed speed for downshifting from 4th to 3rd gear. In my ECU-tuned Civic, I can drop to 3rd at 50 mph on track days to spool the turbo, but on the street it shifts smoothly only above 70 mph. Heel-toe downshifting needs to become muscle memory – especially during cornering, the rev-matching footwork must be crisp. Keep the RPM difference within 500 rpm for jerk-free shifts. The sweet spot varies wildly between cars: NA engines shift smoothly at 2,500 rpm, while turbocharged ones need 3,500 rpm to really wake up.

[Carson]

Newbies often ask this question during car repairs, but actually, engine RPM is the key point. When cruising in fourth gear and the RPM drops below 2000, and the car body starts to shake, it's time to shift to third gear. I've disassembled BMW transmissions, and most of the synchronizer wear is caused by downshifting hard above 3000 RPM. For daily driving, shifting between 60 to 80 km/h is the safest, keeping the RPM between 2500 to 4000. This ensures stable transmission oil pressure and reduces clutch plate wear. Remember, don't hesitate when shifting gears; large speed fluctuations can cause more damage to the car.

[Sherry]

Fuel-saving enthusiasts sharing tips: When driving on the highway in fourth gear at 1700 RPM, the fuel consumption is around 5 liters. Shifting to third gear and raising the RPM to 3000 causes the fuel consumption to soar to 7 liters. I've tested the Honda 1.5T, and its most economical speed is maintaining 65 km/h in fourth gear. For overtaking and acceleration, it's most cost-effective to shift to third gear at 70 km/h. When descending a basement ramp, it's best to slow down to 30 km/h in advance and shift to second gear, as stubbornly staying in fourth gear can stall the engine. Last time I drove a colleague's electric car, I realized that shifting gears in a fuel-powered car is truly a skill. Now, when teaching my daughter to drive, I make her remember 'shift at 2000 RPM without hesitation'.

[StEmilio]

A common issue at driving schools is students trying to shift from 4th gear to 3rd at 50 km/h, resulting in gear grinding. Teach them this foolproof method: in 4th gear, release the throttle at 2500 RPM, and the moment RPM drops to 1800, push into 3rd gear - smoothest around 60 km/h. For manual pickup trucks on mountain roads, downshift 100 meters before curves; shifting to 3rd at 45 km/h aligns perfectly with the turn. Rain demands extra caution - forcing 3rd gear above 70 km/h greatly increases skid risk. When uncertain, shift at 3000 RPM - slightly more fuel consumption but protects the transmission.