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A 4x4 Jeep Wrangler operating off-road
A Four-wheel drive (also called 4WD and 4x4) is a vehicle on which all four wheels get power from the engine to move forward. This is as opposed to a two-wheel drive vehicle. 4WDs are often used off road. Part-time and full-time four wheel drive vehicles uses a transfer case as part of the drivetrain to direct power to one or both axles.[1] By having a transfer case the driver can shift the vehicle into either "two-wheel-drive" or "four-wheel-drive" mode (part-time systems). Many transfer cases also have a low power range that multiplies the engine power when in four-wheel drive (called four-wheel low gear).
- ↑ Ronald Montoya (9 July 2013). "Do You Need an All-Wheel-Drive or Four-Wheel-Drive Car?". Edmunds.com, Inc. Retrieved 30 August 2015.