Trunnion

Trunnion – Free Movement Suspension

The trunnion can be found where the upper control arm attaches to the spindle. The trunnion was used on older applications like the 1963-64 AMC Rambler. This part was attached to the upper control arm with steel threaded bushings. The center of the trunnion has a bronze bushing in the center, which slides onto the shaft of the spindle, bearing first, and then is attached with a castellated nut. The trunnion allows the spindle to rotate when the vehicle is steering. The trunnion acts similar to a ball joint but is not used in newer applications.