Frequently Asked Questions About Peterbilt 357/378 Fuel Tank Fairings

What years and models are these fuel tank fairings compatible with?

These fuel tank fairings are designed specifically for Peterbilt 357 and 378 models manufactured between 1987 and 2007. They fit both standard and extended hood versions. However, if your truck has aftermarket modifications to the fuel tank area or custom exhaust configurations, fitment may vary. We recommend checking your specific truck's measurements against our product specifications or contacting our support team with your VIN for confirmation.

Are these fairings made from fiberglass or aluminum, and which material is better?

We offer both fiberglass and aluminum options. Fiberglass fairings are lighter weight (typically 15-20 lbs per side) and more affordable, but require periodic maintenance and can crack under extreme stress. Aluminum fairings are more durable, resistant to cracking, and easier to polish or paint, though they cost approximately 40-60% more. For trucks in harsh weather conditions or frequent off-road use, aluminum is recommended. For highway applications where weight savings matter, fiberglass performs excellently.

How difficult is the installation process, and what tools are required?

Installation typically takes 2-4 hours per side for someone with basic mechanical skills. You'll need a drill with metal bits, measuring tape, marker, socket set, and mounting hardware (usually included). The fairings mount using existing frame holes when possible, though some drilling may be required. Common challenges include aligning the fairings with existing exhaust stacks and ensuring proper clearance from moving parts. Detailed installation instructions are included, and our tech support can provide guidance if needed.

Do these fairings come in different finishes, and can they be painted?

Fiberglass fairings come in a gel-coat finish (white or black) ready for painting or can be left as-is. Aluminum fairings are available in mill finish, polished, or powder-coated options. Both materials can be custom painted to match your truck. For painting fiberglass, light sanding and primer application are recommended. Aluminum requires proper surface preparation and adhesion promoter for best results. Many customers choose to have them professionally painted during installation for a factory-matched finish.

Will these fairings affect fuel tank access or maintenance?

Our fuel tank fairings are designed with maintenance in mind. Most models feature removable panels or hinged sections that allow access to fuel caps, drain valves, and tank straps without removing the entire fairing. However, some routine maintenance tasks may take slightly longer. For major fuel tank service, the fairings can be removed in approximately 30 minutes per side. We recommend checking the specific product details for your chosen model, as access features vary between full-wrap and partial coverage designs.