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Radius Arm Front Suspension Design. Despite the design used to prevent the axle from rotating freely, during articulation it is possible for the axle to roll, which in itself will cause issues. When used as a driving wheels suspension, the upright/knuckle is connected to a half drive shaft (as shown below in diagram uel2) with an outboard cv (constant velocity) joint that rises and falls with the wheel.
4" Radius Arm Systems 2020 Ford Super Duty NPA 370 BDS from blog.bds-suspension.com
2) suspension travel is not less than 25.4mm (1 inch) for both jounce and rebound. The main objective of this document is to provide complete guidance in designing and calculation of an independent suspension system with double control arms. With a radius arm you will get more caster in bump and less in droop.
4" Radius Arm Systems 2020 Ford Super Duty NPA 370 BDS
If you run it as it is, something will eventually break if you wheel it. They mount to a perch on the frame and solidly to the axle housing and allow the axle to pivot up and down. The front track width of 51 inches and rear track width of 49 inches. Radius arms require the axle to be able to twist with respect to the mounts.
