What speed in 4th gear does not harm the car?

[VonJackson]

Driving in 4th gear at 70 mph does not harm the car, and the speed should be kept below 70 mph. Here is relevant information: P (Parking gear), starting gear: When the car is parked and not in use, the gear is in this position, and the wheels are mechanically locked to prevent rolling. The vehicle must be completely stopped before using the P gear, otherwise the mechanical parts of the automatic transmission may be damaged. R (Reverse gear): Used for reversing. Unlike manual transmission cars, automatic transmission cars cannot use semi-clutch, so special attention should be paid to the control of the accelerator pedal when reversing. Usually, the safety button on the shift lever must be pressed before moving the lever to the "R" gear.