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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.
R4 layout, the engine is located behind the rear axle. In automotive design, an R4, or rear-engine, four-wheel-drive layout places the engine at the rear of the vehicle, and drives all four roadwheels.
The powertrain layout of a motorised vehicle such as a car is often defined by the location of the engine or motors and the drive wheels.. Layouts can roughly be divided into three categories: front-wheel drive (FWD), rear-wheel drive (RWD) and four-wheel drive (4WD).
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.
It offered the following modes: 4H LK, 4H, N, and 4L. In 4H (full-time 4WD High) a center differential with a viscous limited-slip coupling is used between the front and rear output shafts. A 2.61:1 low range was engaged in 4WD Lo mode. And in both '4H LK' (4WD Hi Locked) and '4L' modes the center differential is mechanically locked.
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Audi R8 (Type 4S), an example of an M4 vehicle In automotive design, an M4, or Mid-engine, Four-wheel-drive layout places the internal combustion engine in the middle of the vehicle, between both axles and drives all four road wheels.