Four Link Rear Suspension
A four link suspension is a suspension commonly used on many cars and trucks. This suspension can accommodate applications ranging from "off-roading", to drag racing. There are many variations in which, a four link suspension can be built, and it is imperative to install the correct suspension, based on the type of vehicle it is put on. For example, a four link suspension that is designed for drag racing, will not perform well on a car that is suited for street racing, and cornering.
A four link suspension uses four mounting points on the axle and four on the frame with two on each side. At each mounting point, aircraft style rod ends provide movement at various angles which allows some flexibility. This design is what allows the four point suspension to be either tight or loose while using many of the same components between the two setups. Swapping out a normal suspension that uses leaf springs or other types of springs with a four point suspension will increase performance and handling, but it is an expensive component to replace and it requires allot of work since many other parts are attached to the suspension. When upgrading to a four link suspension, it is a good idea to buy all the parts as a kit so that all the parts that are needed for the conversion are purchased. Since not all vehicle frames can accommodate this type of suspension, it is important to check before purchasing to ensure that the vehicle that it is being installed on will accommodate it.
There are two primary types of four link suspensions that are commonly used which are the parallel and triangulated suspensions. Both of these suspension setups accomplish the same thing which is to hold the axle to the frame of the vehicle as it takes sharp turns or experiences hard acceleration and breaking. The parallel suspension uses two bottom links that keep the axle in place front to back. The upper two links keep the axle from rotating and keeps the pinion angle constant. In a triangulated four link suspension, the setup is very much like the parallel suspension except for the fact that the upper bars also work to keep the rear end centered under the car so a panhard rod isn't needed. This second setup provides more clearance for exhaust, fuel tank, batteries, and generally gives the rear suspension a clean look.
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