[robnolimit]

This is a side view of a basic 4-bar, or three link. We'll start here. Upper bar, lower bar, these are each mounted on the axle, and on the chassis. This is a SIDE VIEW only, to start the conversation. These pars push and pull to apply force to the chassis. The amount of force, and direction of the force would be a 'Vector', but we will keep it simple. For now, it is the center of each mounting point that we are interested in.