Frequently Asked Questions About Peterbilt 389 Deck Plates & Air Line Boxes

Will these deck plates fit my specific year Peterbilt 389?

Our deck plates and air line boxes are designed to fit Peterbilt 389 models from 2008 to present. However, there can be slight variations between model years, particularly in mounting hole patterns. We recommend verifying your truck's specific measurements before ordering, especially if you have a 2008-2010 model, as these early years sometimes have different spacing. If you're unsure, contact us with your VIN and we can help confirm compatibility.

What's the difference between aluminum and stainless steel deck plates?

Aluminum deck plates are lighter weight (typically 40-50% lighter than stainless) and more affordable, making them ideal for weight-conscious operations. They resist corrosion well but may show scratches more easily. Stainless steel deck plates offer superior durability, better resistance to road chemicals and salt, and maintain their polish longer. Stainless is the preferred choice for show trucks or harsh winter conditions, while aluminum works great for most everyday applications.

Do I need to drill new holes or modify my truck for installation?

Most of our deck plates are designed as direct bolt-on replacements using existing factory mounting points. No drilling is typically required for standard installations. However, some custom or aftermarket configurations may require minor modifications. Air line boxes usually mount using existing frame rail holes, but verify your specific setup first. Installation typically takes 1-2 hours per side with basic hand tools.

How do I match the finish to my existing chrome or polished accessories?

We offer three main finishes: mirror-polished stainless steel, brushed stainless steel, and polished aluminum. Mirror-polished stainless provides the brightest chrome-like appearance and matches most aftermarket chrome accessories. Brushed stainless offers a more subtle, professional look that hides minor scratches better. Polished aluminum has a slightly different shine than stainless but still provides an attractive appearance at a lower cost. For the best match, we recommend ordering all visible deck plates in the same material and finish.

What's included with the deck plates and air line boxes, and what else might I need?

Deck plates typically include the plate itself and mounting hardware (bolts, washers, and nuts). Air line boxes come with the box, mounting brackets, and hardware. You may need to purchase air line fittings separately depending on your specific airline configuration. Some installations benefit from new rubber gaskets or weatherstripping (sold separately) to ensure a tight seal. We also recommend having stainless steel polish on hand for maintenance of polished finishes.