Peterbilt 387 Deck Plates & Air Line Boxes

Frequently Asked Questions About Peterbilt 387 Deck Plates & Air Line Boxes

What are deck plates and air line boxes used for on a Peterbilt 387?

Deck plates are the flat panels that sit behind the cab on the frame rails, providing a walkable surface and a mounting point for components. Air line boxes are enclosures mounted on or near the deck plate that organize and protect the air lines and electrical connections running between the tractor and trailer. Together, they keep the back-of-cab area clean, functional, and easier to service.

Will these deck plates and air line boxes fit my Peterbilt 387 without modification?

Products in this category are designed to match the factory mounting points and dimensions of the Peterbilt 387, so in most cases they bolt in using the existing holes and hardware. However, small variations can occur depending on your truck's build year, aftermarket modifications, or previous replacement parts, so it's a good idea to compare measurements and bolt patterns against your existing setup before ordering.

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

You'll typically find these parts made from aluminum or steel, often with a diamond plate pattern for added traction and durability. Aluminum options resist corrosion well and are lighter, while steel versions tend to be more rugged but may require more attention to prevent rust over time. Finish options can include raw, painted, or powder-coated surfaces depending on the specific product.

How difficult is it to install a replacement deck plate or air line box?

Most deck plates and air line boxes are designed for straightforward bolt-on installation using basic hand tools. That said, you may need to disconnect and reroute air lines or electrical connections during the swap, so it helps to take photos of the original setup before removal and have replacement clamps or fittings on hand if the old ones are worn or damaged.

How do I know when it's time to replace my deck plate or air line box?

Common signs include visible rust or corrosion that's compromised the metal's strength, cracked or broken mounting brackets, a deck plate that's become slippery or unstable to walk on, or an air line box with a damaged lid, latch, or mounting tabs that no longer keeps lines secure and protected. Replacing these parts promptly helps prevent further wear on your air lines and electrical connections.