On most vehicles equipped with a part-time four-wheel drive system, it is possible to switch to 4H mode while driving, but it should be noted that the vehicle speed usually needs to be kept below 80km/h and the steering wheel should be kept in a straight line to ensure smooth engagement of the transfer case. Some modern models even support automatic switching within 100km/h. When switching, releasing the accelerator pedal can reduce the impact of the transmission system. If encountering resistance, you can slightly reverse the gear lever or briefly reverse to align the gears. It is worth noting that full-time four-wheel drive vehicles usually do not require manual operation, while the 4H mode of part-time four-wheel drive is only suitable for wet or light off-road conditions. Long term use on dry road surfaces can cause the transmission system to overload. For models equipped with electronic knob switching, the system will automatically determine whether the vehicle speed and road conditions allow switching, which is more intelligent than mechanical gear levers. It is recommended that car owners develop the habit of consulting the manual before operation, as different brands may have slight differences in switching speed limits and operating procedures, such as some models requiring complete parking before switching to low-speed four-wheel drive mode. Understanding these details not only protects the transmission system, but also enhances vehicle grip more safely in rainy weather or sudden situations on rural roads.
