How Does Four-Wheel Drive Work? Four-wheel drive is similar to all-wheel drive in that it sends torque to the four wheels of a vehicle to increase traction as needed, Instamotor explains. However Many high-performance AWD sports cars use a variable torque split, but not Toyota's GR cars. Making an all-wheel-drive car feel simple is, in fact, quite complicated. When I first drove the GR Subaru offers what’s known as a permanent all-wheel drive, meaning all four wheels are driven at all times. Competing systems often disconnect the front or rear axle when extra traction isn’t The Super Select 4WD II used in Pajero is a system that offers four shift on-the-fly driving modes. Drivers can choose between Full-time 4WD (4H), composed of a Viscous Coupling Unit (VCU) and center differential, Mitsubishi-Jeep full-fledged 4WD (4LLc), and rear-wheel 2WD (2H), which improves fuel economy and reduces noise. Hyundai AWD models are engineered to get you there, in any road condition. Our most advanced system, HTRAC AWD (Hyundai TRACtion All Wheel Drive), is available on most SUV models. HTRAC monitors 50 vehicle inputs over 100 times per second to calculate the torque needed for each wheel. If it detects slippage, this intelligent system reroutes Full Forum Listing. 99 & up 7.3L Power Stroke Engine & Drivetrain 6.0L Power Stroke Engine and Drivetrain 99 & up Upgrades and Aftermarket - 7.3L Engine 7.3L IDI Diesels (Not Powerstrokes) 1988-1993. 1980-1982 viscous coupler which provides smooth and efficient four-wheel drive operation on dry surfaces. When a differential in speed occurs between the axles, heat buildup causes the viscous coupler to transfer power to the slower axle. It is similar to several passenger car systems, but with a low-range gear for serious off-roading. There’s a reason: AWD or 4WD cars have to send power to each of the vehicle’s wheels, which requires extra energy. This means 2WD cars are less complex than those with AWD or 4WD, and their simpler drivetrains mean improved fuel economy in the long run. AWD cars also offer worse gas mileage than 2WD rivals because they’re heavier. The differential is a device that splits the engine torque two ways, allowing each output to spin at a different speed. The differential is found on all fuel-burning cars and trucks and also in many all-wheel-drive (full-time four-wheel-drive) vehicles. These all-wheel-drive vehicles need a differential between each set of drive wheels, and An all-wheel drive (AWD) vehicle is one with a powertrain capable of providing power to all its wheels, whether full-time or on-demand. As the name implies, all-wheel-drive systems power both the front and rear wheels all the time. But in practice, there are actually two types of drivetrains that are called AWD. E09s.