How can I tell if my GM truck or SUV has Autoride?

GM trucks and SUVs have Service Parts Identification Label sticker inside the glove box. This label will have your VIN, Wheel Base, Model designation and a list of 3-digit/character RPOs (Regular Production Options). If you see code "Z55" on the label, you have Autoride electronic suspension. Thanks to our friends at Arnott Industries for sharing this.