Mack CV/GU Truck Deck Plates & Air Line Boxes

Frequently Asked Questions About Mack CV/GU Truck Deck Plates & Air Line Boxes

What are deck plates and air line boxes used for on a Mack CV/GU truck?

Deck plates and air line boxes are mounted on the back of the cab or at the rear of the frame to organize and protect the electrical connections, air lines, and glad hands that link the tractor to the trailer. The deck plate provides a mounting surface for these components while the air line box shields the hose connections from road debris and weather.

Will a replacement deck plate or air line box fit my specific Mack CV or GU model year?

Most deck plates and air line boxes in this category are designed to match the factory mounting points and dimensions used on Mack CV and GU series trucks, but exact fitment can vary by model year and cab configuration. Check the listed specifications and part numbers against your truck's existing setup, or contact our sales team with your VIN or truck details to confirm compatibility before ordering.

What materials are these deck plates and air line boxes made from, and which is the better choice?

These parts are typically available in steel, aluminum, or stainless steel. Steel options are durable and budget-friendly but can be prone to rust if the finish is compromised. Aluminum is lighter and naturally corrosion-resistant. Stainless steel offers the best combination of strength and long-term corrosion resistance, along with a cleaner appearance, though it usually comes at a higher price point.

Are these deck plates and air line boxes easy to install, and what tools will I need?

Installation generally involves removing the old unit and bolting the new one into the existing mounting holes, so basic hand tools such as wrenches and sockets are usually sufficient. Depending on your setup, you may need to disconnect and reconnect air lines and electrical connectors, so it helps to label or photograph the original wiring and hose routing before you start.

How do I keep my deck plate and air line box looking good and functioning properly over time?

Regularly clean off road grime, salt, and debris to prevent buildup around the air line and electrical connections. Inspect mounting bolts periodically to ensure everything stays secure from vibration, and touch up any chips or scratches on painted or coated finishes promptly to reduce the risk of corrosion starting underneath.