Frequently Asked Questions About Peterbilt 379 Frame Crossmembers & Covers

What years and models are these crossmembers compatible with?

Our frame crossmembers and covers are designed specifically for Peterbilt 379 models from 1987 to 2007. Most crossmembers are universal across these years, but some variations exist based on wheelbase length and suspension type. Extended hood models (127" BBC) and standard hood models (119" BBC) use the same crossmember mounting points. Always verify your truck's wheelbase and check the product description for any specific compatibility notes.

Are these crossmembers made from aluminum or steel, and which is better?

We offer both aluminum and steel options. Aluminum crossmembers typically weigh 40-60% less than steel versions, improving fuel economy and reducing frame stress. They resist corrosion without coating but cost more upfront. Steel crossmembers are more affordable and extremely durable, though they require powder coating or chrome plating to prevent rust. For show trucks or coastal operations, aluminum is preferred. For heavy-duty work applications where impact resistance matters most, steel remains the top choice.

Can I install these myself, or do I need professional help?

Installation complexity varies by product. Basic bolt-on covers can be installed in 30-60 minutes with standard hand tools. Full crossmember replacements require lifting equipment, proper frame support, and typically 3-4 hours of work. You'll need a floor jack, jack stands rated for commercial trucks, and potentially an impact wrench. Many customers successfully complete DIY installations, but if you're replacing structural crossmembers or lack proper lifting equipment, professional installation is recommended for safety.

What finish options are available, and how do they hold up?

Common finishes include mirror-polished stainless steel, chrome-plated steel, powder-coated steel, and brushed or polished aluminum. Chrome and polished stainless maintain their shine longest with regular cleaning but show water spots easily. Powder coating offers excellent durability in black, white, or custom colors, lasting 5-10 years with proper care. Bare aluminum develops a protective oxidation layer but requires polishing to maintain shine. Consider your maintenance schedule and regional weather when choosing.

Will aftermarket crossmembers affect my frame warranty or DOT compliance?

Decorative covers that bolt over existing crossmembers won't affect warranties or compliance. However, replacing structural crossmembers with aftermarket versions may impact frame warranties on newer trucks still under coverage. All our structural crossmembers meet or exceed OEM strength specifications and DOT requirements. We recommend keeping your original parts and documentation. For trucks under warranty, consult your dealer before replacing structural components. Decorative additions are always warranty-safe.