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Early front-wheel drive vehicles (such as the 1930s Citroen Traction Avant) and the front axles of off-road four-wheel drive vehicles used universal joints rather than CV joints. Amongst the first cars to use CV joints were the 1926 Tracta , the 1931 DKW F1 and the 1932 Adler Trumpf , all of which were front-wheel drive and used the Tracta ...
Automatic locking differentials also affect the ability of a vehicle to steer, particularly if a locker is located in the front axle. Aside from tire scuffing while turning any degree on high friction (low slip) surfaces, locked axles cause understeer and, if used on the front axle, will increase steering forces required to turn the vehicle.
Each half axle connects to the wheel by use of a constant velocity (CV) joint which allows the wheel assembly to move freely vertically as well as to pivot when making turns. In rear-wheel drive cars and trucks, the engine turns a driveshaft (also called a propeller shaft or tailshaft ) which transmits the rotational force to a drive axle at ...
Locking differentials have the ability to overcome the chief limitation of a standard open differential by essentially "locking" both wheels on an axle together as if on a common shaft. This forces both wheels to turn in unison, regardless of the traction (or lack thereof) available to either wheel individually.
Locking hubs, also known as free wheeling hubs are fitted to some (mainly older) four-wheel drive vehicles, allowing the front wheels to rotate freely when disconnected (unlocked) from the front axle. This is done to reduce the mechanical resistance of the front-portion of the drivetrain when four-wheel drive is not in use. [1]
Its design is similar to the Torsen T-2 (slightly less torque bias), and is an aftermarket part for many popular US-made solid axles for rear-wheel drive and 4x4 pick-up trucks. The Truetrac is most often used in the front axle of 4x4 pick-up trucks intended for off-road use, in combination with locking center and rear differentials.
Center axle disconnect on a Dana 60, in a 1999 4x4 Dodge 2500HD. A center axle disconnect system or CAD is an alternative to locking hubs. CAD systems are typically used in front drive axles on four wheel drive vehicles. A CAD system works by having an axle shaft (typically the longer shaft) split into two pieces.
The torque moving the wheels and axles in a forward direction is met with an "equal and opposite" reaction of the axle housing and differential, making the differential want to spin in a reverse direction, in the same way that a cyclist "pops a wheelie", lifting the bicycle in the air in the opposite direction from the turn of the wheel.