Horns and Train Horns The horn in your Jeep is an important safety feature that should be functional at all times. 4WD stocks Jeep air horns kits, Jeep air horn replacements, OE replacement horns, and horn components like elbow and tension washers, horn switches, and relays. Order the parts you need to replace or upgrade the horn in your vehicle. Your horn is important for altering other drivers to your presence. Order a Jeep OE replacement horn or upgrade this safety system with one of our selection of Jeep air horn kits.