Description: All models. 7.4l. Gas engine, 7.4L with ac, without air injection. Express, savana. 7.4l. Without air pump. Allows for the operation of various pulleys, and drive belt accessories, with the use of a single belt Creates a secure point of contact with the pulley, which allows for traction Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type