Peterbilt 379 Rear Fenders

Frequently Asked Questions About Peterbilt 379 Rear Fenders

What's the difference between fiberglass and aluminum rear fenders for my Peterbilt 379?

Fiberglass fenders are lighter weight and more affordable, typically costing 40-60% less than aluminum. They're easier to repair if damaged but may crack under extreme stress. Aluminum fenders are more durable, resist cracking better, and maintain their shape longer, but they're heavier and cost more upfront. Most owner-operators choose fiberglass for cost savings, while fleet operators often prefer aluminum for longevity.

Will these rear fenders fit my specific year Peterbilt 379?

Our rear fenders fit all Peterbilt 379 models from 1987 to 2007. The mounting holes and dimensions are identical across all production years. However, if your truck has aftermarket modifications like custom brackets or non-standard wheelbases, you may need additional hardware. Extended hood models (379X) use the same rear fenders as standard 379s.

Can I install these rear fenders myself, or do I need a professional?

Most customers successfully install rear fenders themselves with basic tools and 2-3 hours per side. You'll need a socket set, drill with metal bits, and ideally a helper to hold the fender in place. The main challenges are aligning the mounting holes and supporting the fender weight during installation. Many customers recommend using jack stands to support the fender while securing bolts.

Do you offer rear fenders with built-in mudflap hangers?

Yes, we stock both styles. Fenders with integrated mudflap hangers save installation time and provide a cleaner look. Fenders without hangers allow you to use aftermarket anti-sail mudflap brackets or custom mounting solutions. Both styles are available in standard widths (typically 24" or 30") and various finishes including primer, painted black, and polished aluminum.

How do I prevent rust and corrosion on steel mounting brackets?

Steel brackets should be treated before installation, even if they come primed. Apply a rust-preventive coating like POR-15 or similar product to all steel surfaces, especially where brackets contact the frame. Many drivers also spray the inside of fender mounting areas with undercoating. For trucks operating in salt states, inspect and recoat brackets annually to maintain protection.