Four Wheel Drive
Repair in Denver

What’s the Difference Between 4WD and AWD?

The distinction has to do with the frequency in which power from the engine and transmission is transferred to either two or four wheels. An AWD system normally sends power to the four wheels all the time. There are some part-time AWD systems that allow electronic sensors to automatically shift between the amount of power directed to each wheel.

For simplification, it is a reasonable assumption that AWD vehicles are continuously operating with four wheels receiving power. A key AWD feature is the lack of input from the driver, though some models allow various modes of the system based on the driving conditions. Wheels in AWD vehicles get torque from the numerous components of the system, including multiple clutches, viscous couplings, and a series of clutches.

Four-wheel drive vehicles tend to have more robust handling capabilities for rugged terrain. Driver input is often required on these vehicles as an electronic switch or mechanical lever must be engaged to operate at “4-High,” “4-Low,” or more complex modes in recent models. The low setting tends to provide the most traction for off-road situations or exceptional circumstances. The high setting is designed for slippery conditions on roadways when traveling at regular speeds. The transfer case and differentials are some of the key components of the 4WD system.