Peterbilt 379 Mirrors, Brackets & Acc.

Frequently Asked Questions About Peterbilt 379 Mirrors, Brackets & Acc.

Will these mirrors and brackets fit my Peterbilt 379 without modification?

Most mirrors, arms, and brackets in this category are designed to match the factory mounting configuration used on the Peterbilt 379, but mirror setups can vary depending on the year of the truck and whether the cab has been customized. Always check the product description for cab style and mounting details, and compare measurements to your existing hardware before ordering to confirm a proper fit.

What materials are these mirrors and brackets made from, and how do the finishes differ?

You will typically find mirror heads, arms, and brackets made from chrome-plated steel, stainless steel, or painted steel, depending on the specific product. Chrome and stainless options are popular for matching the classic look of the 379 and offer good resistance to rust and corrosion, while painted or black finishes are chosen for a more custom or blacked-out appearance. Review each listing to see which finish and material are used.

Are heated and remote-control mirrors available, and do they require any extra wiring work?

Yes, heated mirror options are offered for many mirror assemblies. Installing a heated mirror typically involves connecting to your truck's existing wiring harness, and in some cases splicing into a power source if your truck was not originally equipped with heated mirrors. It is a good idea to review the wiring instructions included with the product or consult a qualified technician if you are not familiar with the truck's electrical system.

How difficult is it to install a replacement mirror, arm, or bracket myself?

Many customers install these parts themselves using basic hand tools, since most mirror arms and brackets bolt directly to existing mounting points on the cab or door. However, jobs involving heated mirror wiring, cab-mounted bracket replacement, or aligning a new arm assembly can take more time and may benefit from a second set of hands. If you are unsure about any step, a shop familiar with Peterbilt trucks can help ensure everything is properly secured and aligned.

My mirror vibrates or does not hold its position while driving -- what could be causing that?

Mirror vibration or drift is usually caused by a worn or loose mounting bracket, a damaged arm, or hardware that has loosened over time from road vibration. Inspect the bracket and arm for cracks, rust, or play at the pivot points, and make sure all mounting bolts are torqued to the proper spec. In many cases, replacing a worn bracket or arm resolves the issue without needing to replace the mirror head itself.