Peterbilt 357/378 Tool & Battery Boxes

Frequently Asked Questions About Peterbilt 357/378 Tool & Battery Boxes

Will these tool and battery boxes fit my Peterbilt 357 or 378 without modification?

Boxes listed in this category are designed to mount to the frame or step areas commonly used on the Peterbilt 357 and 378 chassis. That said, frame rail spacing, step configuration, and prior modifications can vary from truck to truck, so it's a good idea to compare the mounting dimensions listed in the product description against your own truck before ordering. If you're unsure, contacting our parts team with your VIN or frame measurements can help confirm fit.

What materials are these boxes made from, and which one is right for my truck?

Most tool and battery boxes in this category are constructed from aluminum or steel, often in smooth, treadplate (diamond plate), or polished finishes. Aluminum options tend to be lighter and naturally resist rust, making them a popular choice for battery boxes exposed to road spray. Steel boxes are typically heavier duty and may be preferred for tool storage where extra durability is a priority. Your choice often comes down to the balance you want between weight savings and long-term corrosion resistance.

How do I install a tool or battery box on my Peterbilt, and can I do it myself?

Installation generally involves bolting the box to existing frame brackets or step mounts, and many drivers are able to install these themselves with common hand tools. However, battery boxes require additional care since they involve disconnecting and relocating battery cables and ensuring proper electrical grounding. If you're not comfortable working around battery connections, we recommend having the installation done by a qualified technician.

Are these boxes lockable, and how weather-resistant are they?

Many tool and battery boxes in this category include a lockable latch or are pre-drilled to accept a padlock or keyed lock, which helps protect tools and equipment stored inside. While the boxes are built to hold up to road conditions, weather resistance can vary by material and finish, so check the specific product listing for details on seals, drainage, or gasket features if keeping contents completely dry is a priority.

Can I get a tool or battery box that matches the rest of my truck's polished or painted look?

Yes, many of these boxes are available in a range of finishes, including polished aluminum, treadplate, and smooth panels that can be painted to match your truck. If matching your existing exterior is important, check the finish options listed for each product, and feel free to reach out if you need help identifying a box that complements your Peterbilt's current setup.