When driving in 4 High (4H), most experts and manufacturer guidelines recommend a maximum speed range of 30 to 55 mph (about 50 to 90 km/h), depending on your specific vehicle and road conditions.
Recommended Speed Range
- 30–55 mph is widely suggested as a safe limit for most vehicles in 4 High.
- Some vehicles, such as the Toyota 4Runner, may allow speeds up to 60 mph in 4H mode, but it’s generally considered unnecessary or even risky to use 4WD at highway speeds unless absolutely needed for traction.
- Always check your owner’s manual for the specific speed limit for your make and model.
Why Limit Speed in 4 High?
- Higher speeds in 4 High increase stress on the drivetrain and raise the risk of drivetrain binding, especially on dry pavement.
- Driving too fast in 4H can reduce vehicle control and potentially damage mechanical components if surfaces are not consistently slippery or loose.
- 4 High should be used primarily for moderate off-road conditions, snow, ice, or loose gravel, not dry pavement at high speeds.
Manufacturer Recommendations
- Many automakers recommend not engaging or disengaging 4H above 45 mph.
- Speed limits in 4 High can vary slightly by model, with 55 mph often cited as a common manufacturer maximum.
Always follow your specific vehicle’s manual and adjust your speed based on current driving conditions and safety.
