Frame Reference Point Description
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Reference points are locations on a vehicle which correspond to specific measuring points. Use the reference points when checking the vehicle structure.
Dimension charts may use the center of a hole, bolt head, or nut, etc. as a reference point. A description and location chart will tell you how and where the measurements should be taken. The most accurate reference point is a gauge hole or a control hole used by the assembly plant in order to control tolerances when the vehicle was built. Refer to Frame Control Hole Description for more information about control holes.