Freightliner FL70-FL80 Deck Plates-Air Line Boxes

Frequently Asked Questions About Freightliner FL70-FL80 Deck Plates-Air Line Boxes

What is the purpose of a deck plate and air line box on a Freightliner FL70-FL80?

The deck plate and air line box assembly sits behind the cab on the truck's frame, providing a mounting surface for the air, electrical, and glad hand connections that link the tractor to the trailer. It also acts as a protective housing to keep those lines and fittings organized, secured, and shielded from road debris.

Will this deck plate or air line box fit my specific FL70 or FL80 model year?

Fitment can vary depending on the model year, cab configuration, and how the original air and electrical lines were routed on your truck. We recommend checking the listed specifications and measurements against your existing unit before ordering, and comparing bolt patterns or mounting points if you're unsure. If you have questions about a particular application, our parts specialists can help confirm fitment before you buy.

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

Most deck plates and air line boxes in this category are constructed from steel or aluminum, chosen for durability under constant exposure to road debris, moisture, and vibration. Steel versions typically come with a protective coating or finish to resist corrosion, while aluminum options offer a lighter weight alternative with natural rust resistance. Either option is built to handle the day-to-day wear of highway and vocational use.

Can I install a replacement deck plate or air line box myself, or do I need a shop?

Many truck owners and independent mechanics replace these components themselves, since installation generally involves unbolting the old unit, transferring or reconnecting the air lines and electrical connectors, and securing the new plate or box in place. That said, if your original setup has been modified, has non-standard routing, or you're not comfortable working around air brake lines, having a qualified technician handle the install is a safe bet.

Do these parts come pre-drilled or do they include mounting hardware?

This depends on the specific product. Some deck plates and air line boxes ship pre-drilled to match common Freightliner FL70-FL80 mounting points, while others may require drilling to match your truck's existing holes. Check the individual product description for details on included hardware and drilling requirements before you order, and reach out to us if you need clarification.