Peterbilt 359 Frame Nut Covers

Frequently Asked Questions About Peterbilt 359 Frame Nut Covers

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

Our Peterbilt 359 frame nut covers are available in two primary materials: chrome-plated ABS plastic and stainless steel. The chrome-plated ABS options offer an affordable solution with good durability and resistance to cracking, though they may show wear after several years of heavy use. The stainless steel versions provide superior longevity and won't rust, making them ideal for trucks exposed to harsh weather conditions or road salt. Both materials are designed to withstand typical highway conditions and maintain their appearance with basic maintenance.

Will these nut covers fit my specific year Peterbilt 359, and what about 379 models?

These frame nut covers are designed specifically for Peterbilt 359 models from 1967-1987. The standard size fits 1-1/2" lug nuts, which is the most common size on these trucks. While some covers may physically fit on early 379 models (1987-1991), we recommend checking your specific lug nut size first, as later 379s often use different sizing. If you're unsure, measure your lug nuts or contact us with your truck's OEM for verification.

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

Installation is straightforward and typically takes 30-45 minutes for a full set. Most of our nut covers are push-on style that require no tools - simply clean the existing nuts and press the covers firmly into place. Some models feature a twist-lock design that includes a small set screw for added security. For these, you'll need a small Phillips or hex key (usually included). The most challenging part is usually accessing nuts behind the fuel tanks or other components, which may require removing splash guards.

What styles and finishes are available, and which look most authentic?

We offer several styles including pointed bullet-style, rounded dome, and flat-top designs. Finishes include mirror chrome, brushed stainless, and powder-coated options in black or custom colors. For authentic restoration, the pointed chrome covers most closely match the original factory appearance on 1970s-era 359s. The dome style became more popular in the 1980s. Many drivers mix styles, using pointed covers on the front axle and dome style on the rear for a custom look.

How many covers do I need for a complete set, and do they stay on at highway speeds?

A standard Peterbilt 359 typically requires 20 covers for the front axle (10 per side) and 40 for tandem rear axles (20 per side), totaling 60 pieces. Single-axle trucks need only 40 total. Quality covers with proper fitment will stay secure at highway speeds when correctly installed on clean, rust-free nuts. If covers come loose, it's usually due to rust buildup or incorrect sizing. We recommend checking fitment after the first 100 miles and periodically during pre-trip inspections.