Mack R Truck Deck Plates & Air Line Boxes

Frequently Asked Questions About Mack R Truck Deck Plates & Air Line Boxes

What are deck plates and air line boxes used for on a Mack R Model?

Deck plates are the flat, often diamond-textured metal panels that sit behind the cab on the frame, providing a walkable surface and finished look between the cab and fuel tanks or fifth wheel area. Air line boxes are mounted on or near the deck plate to organize and protect the air and electrical lines that run to the trailer, keeping hoses and cables from dragging, tangling, or getting damaged while the truck is in motion.

Will these deck plates and air line boxes fit my Mack R Model without modification?

Products in this category are designed to match the factory dimensions and mounting points used on Mack R Model trucks, but frame spacing, tank placement, and prior modifications can vary from truck to truck. We recommend checking listed measurements and comparing them to your existing setup before ordering, and confirming bolt pattern locations if your truck has been customized or repaired in this area.

What materials and finishes are available for these parts?

Most deck plates and air line boxes are offered in steel or aluminum, with finish options that typically include plain, polished, or stainless steel. Steel offers strength and a traditional look, while aluminum and stainless options are popular for their resistance to rust and corrosion, which is especially useful given their exposure to road spray and weather.

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

Installation generally involves removing the old plate or box and bolting the new one into the existing mounting holes, so most drivers and shop technicians can complete the job with common hand tools. If the replacement part does not share the exact hole pattern as the original, some drilling or minor fabrication may be needed to get a clean, secure fit.

Can I run new air lines and electrical cables through these boxes, or are they for organization only?

Air line boxes are built to route and protect the air lines and electrical cables that connect to the trailer, keeping them bundled and out of the way of moving parts or road debris. They are not just cosmetic covers; proper installation should ensure lines are secured and have enough clearance to move freely without rubbing or kinking as the truck turns or the suspension flexes.