Peterbilt 357/378 Cab Repair Parts

Frequently Asked Questions About Peterbilt 357/378 Cab Repair Parts

What kinds of cab repair parts are included in this category?

This category covers structural and cosmetic cab repair panels for Peterbilt 357 and 378 models, including items such as cab corners, floor panels, door skins, cowl panels, and other sheet metal repair sections used to fix rust damage, collision damage, or general wear on the cab structure.

Will these parts fit my specific Peterbilt 357 or 378 without modification?

Most cab repair panels are designed to match factory dimensions for the specified model and year range, but because cab configurations can vary slightly over production years, it is important to verify the part number against your truck's VIN or existing panel measurements before ordering. Some trimming or fitting during installation is common with aftermarket sheet metal parts.

What material are these cab repair panels made from, and do they come pre-finished?

These panels are typically made from steel or aluminum, matching the original cab construction. Most are sold in raw, unpainted form so they can be primed and painted to match your truck after installation, though some parts may include e-coating or a protective finish to prevent corrosion before final paint.

Do I need to weld these parts in, or can they be bolted on?

The majority of cab repair panels, such as cab corners and floor sections, are designed to be welded into place to restore structural integrity, similar to how the original panel was attached. A small number of cosmetic trim or patch pieces may allow for bolt-on or rivet installation, so check the product description for the specific installation method before you buy.

Can these parts be used to pass a DOT inspection for cab or floor corrosion?

Properly installed cab repair panels can help address structural rust or damage that might otherwise be flagged during a DOT inspection, but the repair must be done correctly and may need to meet specific structural standards depending on your local regulations. We recommend having any structural cab repair performed or verified by a qualified technician familiar with DOT requirements in your area.