GMC TopKick Truck Deck Plates & Air Line Boxes

Frequently Asked Questions About GMC TopKick Truck Deck Plates & Air Line Boxes

What is the difference between a deck plate and an air line box?

A deck plate is the mounting surface behind the cab that provides a flat, durable base for attaching air lines, electrical cords, and other components between the tractor and trailer. An air line box is typically mounted to or built into the deck plate and houses the glad hand connections and electrical pigtail plugs, keeping the lines organized and protected from road debris and weather exposure.

Will a deck plate or air line box fit my GMC TopKick without modification?

Fit can vary depending on the model year and cab configuration of your GMC TopKick, as well as the specific frame width and hole spacing on your truck. We recommend checking listed dimensions and mounting patterns closely before ordering, and comparing them to your existing setup or factory specs. In some cases, minor drilling or bracket adjustment may be needed to achieve a proper fit.

What materials are these deck plates and air line boxes made from, and how do they hold up over time?

Most deck plates and air line boxes are constructed from steel or aluminum, with finish options like raw steel, painted, or polished aluminum. Aluminum options tend to resist corrosion better and are lighter, while steel construction offers added durability under heavy use. The right choice often depends on whether you prioritize weight savings or long-term resistance to rust in harsh weather conditions.

How do I install a replacement deck plate or air line box on my TopKick?

Installation generally involves removing the old unit by unbolting it from the frame, disconnecting air lines and electrical connections, then mounting the new deck plate or air line box using the existing bolt pattern where possible. It is important to reseal any mounting points to prevent moisture intrusion and to double check that air line and electrical connections are routed correctly before returning the truck to service.

Can I mount additional accessories, like a pintle hook or extra lights, to my deck plate?

Many deck plates are designed with extra mounting space or pre-drilled holes that allow for additional accessories such as pintle hooks, tool boxes, or lighting brackets. However, available space and load ratings vary by product, so it is a good idea to confirm the specific plate's design and weight capacity before adding extra hardware.