Transfer case - explanation

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added in 4x4 & diff lock by BetaEx

[img] Vehicle engine and drive wheel placement diagrams, Moebiusuibeom-en (2010)

A transfer case is a component commonly found in four-wheel drive (4WD) and all-wheel drive (AWD) vehicles. Its primary function is to distribute power from the vehicle's transmission to both the front and rear axles, allowing for better traction and control in off-road and slippery conditions.

How transfer case works

  1. Power Distribution: The transfer case receives power from the vehicle's transmission, typically through a driveshaft. It can be operated manually or automatically, depending on the vehicle.

  2. Selection of Drive Mode: The transfer case allows the driver to select different drive modes, such as 2WD (two-wheel drive), 4WD (four-wheel drive), and, in some cases, additional settings like 4WD Low or 4WD High. The specific modes available can vary depending on the vehicle's design and capabilities.

    • 2WD: In this mode, only one set of wheels (either front or rear) receives power from the transmission. This mode is used for normal, everyday driving conditions on paved roads.
    • 4WD: When 4WD is engaged, power is distributed to both the front and rear axles simultaneously, providing improved traction in off-road, slippery, or low-traction conditions. This mode is commonly used when driving on uneven terrain, mud, snow, or off-road trails.
    • 4WD Low: 4WD Low is typically used for more extreme off-road conditions or when additional torque and control are needed, such as when crawling over rocks or steep inclines. It provides a lower gear ratio, which increases torque but reduces speed.
    • 4WD High: 4WD High is used for better traction on rough terrain but at higher speeds than 4WD Low. It's suitable for off-road driving at moderate speeds.

The specific operation and controls of a transfer case may vary between different vehicle models and manufacturers. Some modern vehicles also feature automatic or electronic control systems that can automatically adjust power distribution to the wheels based on traction conditions.