Four-wheel drive high (4HI) is a drivetrain setting designed for enhanced traction on slippery or uneven surfaces such as gravel, loose dirt, snow, or light off-road conditions. While it provides superior grip compared to two-wheel drive, 4HI is not intended for high-speed travel. Driving at excessive speed in this mode can strain the drivetrain components, negatively impacting fuel economy and potentially causing mechanical damage. Typically, manufacturers recommend against exceeding speeds of 55-70 mph (88-112 km/h) while engaged, though the exact recommended speed can vary based on the specific vehicle and its tires. Consulting the owner’s manual is crucial for vehicle-specific guidance.
The value of this drivetrain setting lies in its ability to distribute power to all four wheels, maximizing grip in challenging driving situations. Historically, four-wheel drive systems were primarily found in off-road vehicles. However, their benefits in inclement weather and on uneven terrain have led to their wider adoption in various vehicle types, including SUVs and crossovers. Maintaining a safe speed while utilizing this mode allows drivers to navigate adverse conditions with confidence while preserving the integrity of their vehicle’s drivetrain.