Frequently Asked Questions About Peterbilt 389 Cab, Sleeper & Cowl Panels

Will these panels fit my specific year Peterbilt 389, and what about 388 models?

Most aftermarket cab, sleeper, and cowl panels are designed to fit Peterbilt 389 models from 2008 to present. However, fitment can vary between manufacturers. The 388 and 389 share many body components, but there are subtle differences in mounting points and dimensions. Always verify the specific year range listed for each product, and when in doubt, contact us with your VIN number for exact fitment confirmation. Pay special attention to whether your truck has extended hood options or special editions that may affect panel compatibility.

What gauge steel or aluminum are these panels made from, and how do they compare to OEM?

Quality aftermarket panels typically use 16-18 gauge steel or .080-.125 aluminum, depending on the application. OEM Peterbilt panels are generally 16 gauge steel or .090 aluminum. Premium aftermarket options match or exceed OEM thickness, while economy panels may be slightly thinner. Steel panels offer better dent resistance but are heavier and prone to rust if not properly maintained. Aluminum panels are lighter and corrosion-resistant but may be more expensive and require special welding techniques if repairs are needed.

Do I need to drill new holes, and what modifications are typically required during installation?

Most quality replacement panels are designed as direct bolt-on replacements using existing mounting holes. However, some trimming or minor adjustments are common, especially around light openings and edge gaps. Cowl panels often require the most precise fitment work. You may need to transfer mounting brackets, grommets, and trim pieces from your old panels. Professional installation typically takes 4-8 hours per panel, depending on complexity. Having a helper and proper panel alignment tools will significantly improve fit and finish.

What finish options are available, and do they come primed or painted?

Cab and sleeper panels are typically available in three finish options: bare metal (requires primer and paint), e-coated primer (ready for paint), or polished stainless steel. Most replacement panels come with e-coat primer that provides excellent paint adhesion and rust prevention. Stainless steel options are available for cowl panels and trim pieces but are significantly more expensive. If you choose primed panels, professional painting is recommended to match your existing cab color and ensure proper UV protection and durability.

How do I identify which specific panels I need to replace?

Start by identifying the damaged area: cab corners, rocker panels, sleeper panels, or cowl sections. Peterbilt uses specific part terminology - for example, "cowl panels" include both the side cowl extensions and the center cowl cover. Take photos of your damaged areas and note whether you have a day cab or sleeper configuration, as panel shapes differ. Measure any rust or damage areas to determine if you need just a patch panel or a full replacement section. Our customer service team can help identify the correct panels if you provide photos and your truck's specifications.