The terms “4 high” and “4 low” refer to the different modes of a 4-wheel drive (4WD) or all-wheel drive (AWD) system in a vehicle. These modes are designed to provide the driver with varying degrees of control over the vehicle’s traction and overall handling in different driving conditions.
To understand what 4 high and 4 low are, it’s important to have a basic understanding of how 4WD and AWD systems work. Both systems are designed to distribute power to all four wheels of a vehicle, rather than just the front or rear wheels, as is the case with most two-wheel drive vehicles.
In a 4WD system, power is typically sent to the rear wheels by default, and the driver can manually engage the front wheels using a transfer case. This transfer case allows the driver to switch between different 4WD modes, including 4 high and 4 low.
4 high, also known as “4H,” is a mode that provides additional traction to all four wheels of the vehicle, making it ideal for driving on slippery or loose surfaces like snow, ice, or gravel. In this mode, the transfer case splits the power between the front and rear wheels evenly, allowing the vehicle to maintain better traction and control in challenging conditions. This mode is best used for highway speeds or moderate off-road driving.
4 low, also known as “4L,” is a mode that provides even more torque and power to the wheels, making it ideal for extreme off-road conditions. In this mode, the transfer case sends more power to the wheels, resulting in slower speeds but more control and torque. This mode is used when driving through deep mud, sand, or over large rocks, and is best for slow and technical off-road driving.
It’s important to note that both 4 high and 4 low are not meant to be used on dry, paved roads, as they can cause damage to the vehicle’s drivetrain. In addition, using 4 low at high speeds can also damage the drivetrain, as the increased torque can put too much stress on the components.
Overall, the choice between 4 high and 4 low depends on the driving conditions and the level of control the driver needs. If driving on slippery or loose surfaces, or in moderate off-road conditions, 4 high may be the best option. However, if driving in extreme off-road conditions, 4 low may be necessary for optimal control and torque. It’s important for drivers to understand the capabilities and limitations of their vehicle’s 4WD or AWD system, and to use these modes appropriately to ensure safe and effective driving.