Tailgate anti-chuck assembly

A vehicle truck box assembly including a tailgate, a hinge-on-box bracket, a puck component, a hinge post, and a plastic shim is provided. The tailgate is pivotally mounted to a truck bed. The hinge-on-box bracket includes a cup extension. The puck component is secured to the cup extension. The hinge post is for securing to the puck component and to a hinge-on-gate bracket and the hinge post defines a cavity. The plastic shim is received in the cavity for contacting the cup extension. The plastic shim may include an upper angle portion extending from a base portion. The upper angle portion may extend between the cup extension and the puck component that are arranged to snugly receive the hinge post. The upper angle portion may extend from the base portion at an angle value between five and fifteen degrees.