Peterbilt 379 Headlights, Housings & Bezels

Frequently Asked Questions About Peterbilt 379 Headlights

What size headlights fit a Peterbilt 379?

Factory 1987–2007 Peterbilt 379 models (both standard 119" and extended 127" hoods) use dual 4x6 inch rectangular headlight buckets with H4 / H13 plug-and-play wiring. Drivers who want a classic look can also install 7-inch single round headlights using custom conversion mounting arms designed specifically for the Peterbilt 379.

What are the clearance requirements for custom 379 headlight buckets?

Standard 379 housings accept drop-in replacements. Modern LED assemblies need a minimum internal mounting depth of 3.5 inches so the rear aluminum heat sinks and cooling fins clear the housing wall without binding.

What is the safest method for installing heavier LED assemblies in a 379?

Having wrestled with these setups on my own 379, I can tell you firsthand: navigating the tight internal cavity of the 379 headlight bucket can be challenging. Because LED projector assemblies are significantly heavier than factory glass sealed beams, trying to wedge them in while mounted on the hood risks dropping and scratching the lens. The cleanest, safest method is to completely unbolt the headlight assembly arm from the hood, giving you easy 360-degree rear access to seat the unit and lock down the retaining rings.

Do LED headlights ice over on a Peterbilt 379 during winter driving?

Yes, because LEDs run much cooler than old halogens, snow and ice can accumulate on the lens during freezing hauls. To maintain clear visibility on winter runs, look for heated Peterbilt 379 LED headlights featuring built-in thermal grids that automatically melt ice below freezing.

What does the manufacturer warranty cover on aftermarket 379 LED assemblies?

Our Peterbilt 379 LED lights carry 1- to 3-year manufacturer warranties protecting against factory defects, diode failure, and weather-seal moisture leaks. Note that physical impact, improper wiring, or incorrect installation voids coverage. Always retain your invoice and register the product to streamline future claims.