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Message: [QUOTE="NotStock, post: 647759, member: 862"] A radius arm (3-link) based system pivots around a single point where it attaches to the frame. Castor sweeps and changes as it rotates. If the truck is articulating (ie one side is compressing when the other is not), one side of the axle is attempting to change castor while the other is not. Given the axle is a solid piece and must act as one, it will bind. Any "flex" that is allowed is bushing and joint deflection. This is why a radius arm (3-link) based system will have tighter steering response because in a way, per design it is acting as a sway bar. A properly designed 4-link will have very little castor change through the suspension cycle. The less castor change, the more freely the axle can articulate without bind. This will in turn allow more free movement of the suspension. In turn allowing more body roll and softer suspension. As to which is better, there are tons of things to take into account that varies depending on the customer and how they use their truck. There are also many design elements that go into 4-links that can create different performance to better suit an application. [/QUOTE]

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