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Most road vehicles use a 2WD layout due to its lightweight and simplicity. Traction on the road is usually sufficient that the driving force can be reliably transmitted through only two wheels. For vehicles that have part-time four-wheel drive, the term refers to the mode when 4WD is deactivated and power is applied to only two wheels.
The Jeep Wrangler (pictured is a TJ Wrangler) is a 4WD vehicle with a transfer case to select low-range or high-range four-wheel drive.. A four-wheel drive, also called 4×4 ("four by four") or 4WD, is a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously.
The NP242 Selec-Trac transfer case debuted alongside the Fuel-Injected 4.0L Inline-6 in the compact Jeep Cherokee in 1987. The shifter has modes 2WD - 4WD Hi Part-Time - 4WD Hi Full-Time - N - 4WD Low. There is a center differential that is open in 4WD Hi Full-Time mode and distributes torque 48/52% front-to-rear.
2H: 2WD, high range. 100% of available power is sent to the rear axle. 4H: 4WD, high range. Power is sent to both the front and rear axles while the centre differential remains unlocked. 4HLc: 4WD, high range, locked centre differential. Power is sent to the front and rear axles with the centre differential locked, ensuring that a percentage of ...
In automotive design, an F4, or front-engine, four-wheel drive (4WD) layout places the internal combustion engine at the front of the vehicle and drives all four roadwheels. This layout is typically chosen for better control on many surfaces, and is an important part of rally racing, as well as off-road driving.
Front-wheel drive or all-wheel drive? Which is Best for You?
Each hydraulically enabled clutch is controlled separately to allow for three modes of operation: 2WD (mode 0) where 100% of available torque is available to the rear axle while the front axle is disconnected, and two 4WD modes which allow for 35/65 front/rear axle torque split (mode 1) or 50/50 front/rear axle torque split (mode 2).
Transfer cases used on "part-time" four-wheel-drive off-road vehicles such as trucks and some specialty military vehicles generally allow the driver to select 2WD or 4WD, as well as high or low gear ranges. Automated versions used in sports cars and performance sedans are usually "transparent" to the driver; there is no shifter or select lever.