Frequently Asked Questions About Peterbilt 357/378 Frame Nut Covers

What material are these frame nut covers made from, and will they rust or corrode?

Our Peterbilt 357/378 frame nut covers are manufactured from either heavy-duty ABS plastic or 304 stainless steel, depending on the specific model you choose. The ABS plastic versions are chrome-plated and resistant to cracking, fading, and weather damage. The stainless steel options offer superior corrosion resistance and maintain their shine even in harsh road conditions. Both materials are designed to withstand road salt, moisture, and extreme temperatures without deteriorating.

Will these frame nut covers fit my specific year and model Peterbilt 357 or 378?

These frame nut covers are designed to fit Peterbilt 357 models from 1987-1995 and Peterbilt 378 models from 1986-1995. They accommodate standard 33mm lug nuts found on these trucks. However, if your truck has aftermarket wheels with different lug nut sizes, you'll need to verify the measurements before ordering. The covers are specifically engineered for the factory bolt pattern and spacing on these model years.

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

Installation is straightforward and typically takes 30-45 minutes for a complete set. No special tools are required - the covers either snap on directly over your existing lug nuts or thread on, depending on the style you choose. Push-on styles require firm pressure to seat properly, while thread-on versions simply screw onto your existing wheel studs. We recommend cleaning the lug nuts thoroughly before installation for the best fit and appearance.

What styles and finishes are available for these frame nut covers?

We offer several styles including pointed, dome, and flat-top designs in chrome, polished stainless steel, and powder-coated finishes. Chrome options provide a mirror-like finish at an economical price point, while stainless steel versions offer long-term durability with minimal maintenance. Powder-coated options are available in black, red, and blue for drivers wanting a custom look. Each style is available in both standard and extended lengths to accommodate different wheel configurations.

How many frame nut covers come in a set, and will I need to order multiple sets?

Frame nut covers are typically sold in sets of 10, which covers one wheel. For a complete truck setup, you'll need to order based on your configuration: 4 sets (40 covers) for a standard single-axle truck, 6 sets (60 covers) for a tandem axle setup, or 8 sets (80 covers) if you're also covering your trailer wheels. We recommend ordering an extra set as spares, as individual replacements can be difficult to match if you lose one down the road.