Frequently Asked Questions About Peterbilt 375/377 Frame Nut Covers

What years and models do these frame nut covers fit?

Our Peterbilt 375/377 frame nut covers are designed to fit model years 1987-2007. They're compatible with both the 375 and 377 models, as these trucks share the same frame rail dimensions and nut spacing. However, we recommend verifying your specific truck's frame rail configuration before ordering, as some custom or modified frames may have different spacing.

Are these covers made of plastic or metal, and will they rust?

Most of our frame nut covers are manufactured from either chrome-plated ABS plastic or 304 stainless steel. The chrome-plated ABS options are lightweight, won't rust, and maintain their shine with minimal maintenance. Our stainless steel options offer maximum durability and corrosion resistance. Both materials are designed to withstand road conditions, weather, and regular washing without deteriorating.

How difficult is the installation, and what tools do I need?

Installation is straightforward and typically takes 30-60 minutes for a complete set. Most covers are press-fit or snap-on designs that don't require special tools - just clean the existing nuts thoroughly and press the covers firmly into place. Some models may require a rubber mallet for a secure fit. No drilling or permanent modifications to your frame are necessary.

Will these covers stay on at highway speeds and through truck washes?

Yes, when properly installed, our frame nut covers are designed to stay secure at highway speeds and through commercial truck washes. The key is ensuring the frame nuts are clean and dry before installation. Many drivers report their covers staying in place for years without issues. For added security, some customers apply a small amount of clear silicone adhesive during installation, though this isn't typically necessary.

What finish options are available, and which looks best with my truck?

We offer several finish options including mirror-polished chrome, brushed stainless, and powder-coated colors like black and red. Chrome is the most popular choice for trucks with existing chrome accessories. Brushed stainless provides a more subtle, professional appearance that hides fingerprints well. Black powder-coated covers work great for murdered-out builds or to match black frame rails. Consider matching your existing wheel accessories and bumper finish for a cohesive look.