Peterbilt 389 Rear Fenders

Choose the Right Peterbilt 389 Rear Fenders

There are numerous Peterbilt 389 rear fender styles. It can be hard to choose. Adding a stainless or paintable rear fender can complement additional exterior chrome upgrades like Peterbilt 389 deck plate covers, Peterbilt 389 sleeper panels, and Peterbilt 389 exterior cab lighting. Frame-mounted fenders are universal; what fits a Peterbilt 379 rear fender will fit its successor, the 389.

Peterbilt 389 Full Rear Fenders

Add maximum coverage of your tire curve and get a custom show-truck aesthetic. Full tandem fenders cover both rear axles in a long, continuous assembly – ideal for show trucks. Fiberglass full radius fenders are highly recommended for Peterbilt truck owners who want a matching custom paint detail with the cab, and a durable material that is resistant to spider-cracking, thanks to its heavy-duty gel-coating.

Peterbilt 389 Half Fenders

Half fenders cover the top section of your tires, adding more clearance for a moving air-ride suspension, and adequate protection from road spray. There are value-based and premium half fender kits for Peterbilt from brands like Vendetta and Hogebuilt, which offers low-rider half tandem fender kits for a more custom look.

Peterbilt 389 Quarter Fenders

Quarter fenders are the most affordable option and mount directly to the frame rail, controlling for more road spray than standard Peterbilt mud flaps would, while enhancing the rear-end visual appeal of the truck, be it with mirror-polished stainless steel or a black polycarbonate finish.

Compare Rear Fender Materials

Stainless Steel Rear Fenders

Stainless steel is the ultimate choice for owner-operators building a "show truck" mirror finish. Premium 304 stainless steel resists corrosion and maintains a brilliant shine, though it requires regular polishing.

Fiberglass Rear Fenders

Fiberglass offers a smooth, seamless profile that is ready for custom paint-matching. High-quality reinforced fiberglass is heavily favored for full-radius and long-drop styles because it can be molded tightly around the wheel arc. Make sure the mounting brackets are perfectly aligned; poor installation can lead to spider-cracking around the mounting zones from road vibration.

Poly Rear Fenders

Polymer (poly) fenders are highly durable and ideal for vocational rigs that work in harsh conditions. This material doesn’t rust, dent, or need painting. Sold in solid base colors, these aren’t paintable, but they also do not need custom paint to match your truck.

Aluminum Rear Fenders

Aluminum strikes the perfect balance between classic metallic styling and lightweight efficiency. This is a great option if you need to keep your truck's curb weight down to maximize payload capacity. Aluminum fenders are typically offered in smooth, ribbed, or diamond-plate finishes, making them highly versatile for different trucking applications.

Peterbilt 389 Rear Fender Fitment Tips

The right fit comes down to axle spacing and suspension type. Buy a rear fender with brackets that match the suspension configuration. If you’re like most Peterbilt 389 owners, riding a Low Air Leaf suspension (2007-newer), you’ll need the right bracket kit configuration so that the mounting plates clear the air bags and U-bolts. Flex Air suspensions have a different geometry and use aluminum trailing arms.

Frequently Asked Questions About Peterbilt 389 Rear Fenders

What material options are available for Peterbilt 389 rear fenders?

Rear fenders for the Peterbilt 389 are typically available in materials such as stainless steel, aluminum, and fiberglass. Stainless steel options often come in polished or diamond plate finishes for added durability and visual appeal, while fiberglass fenders offer a lighter weight alternative that can be painted to match your truck. Choosing the right material depends on your priorities around weight, maintenance, and appearance.

Will these rear fenders fit my specific Peterbilt 389 configuration?

Fender fitment can vary based on your truck's axle configuration, frame width, and whether you have a single or tandem rear axle setup. Always check the product listing for specific fitment details and measurements before purchasing, and compare them against your truck's specifications. If you're unsure, reaching out to our team with your truck's details can help confirm compatibility.

What hardware or mounting brackets are needed for installation?

Most rear fenders require mounting brackets, hardware, and sometimes fender flares or braces to secure them properly to the frame or fender supports. Some products include the necessary mounting hardware, while others may require it to be purchased separately. Reviewing the product description carefully will tell you exactly what's included so you can plan accordingly.

Can I install these rear fenders myself, or do I need a professional?

Many truck owners with mechanical experience are able to install rear fenders themselves using basic tools, especially if brackets and hardware are included. However, proper alignment is important for both appearance and function, so if you're not confident in your ability to align and secure the fenders correctly, having a professional shop handle the installation is a reasonable option.

How do I maintain the finish on stainless steel or polished fenders?

Polished stainless steel fenders will maintain their shine longer with regular washing and occasional polishing using a stainless steel cleaner or polish designed for automotive use. Avoid abrasive pads or harsh chemicals that can scratch or dull the finish. Diamond plate finishes are generally more forgiving and require less frequent maintenance to look good on the road.