Dually trucks, characterized by their dual rear wheels, are the workhorses of the automotive world. These vehicles provide the stability and towing capacity needed for heavy trailers, campers, and industrial loads. However, the very feature that makes them functional—the wide rear stance—also makes them vulnerable. Because dually fenders extend several inches beyond the width of the cab, they are frequently subject to damage from tight parking spaces, debris, or trailer mishaps.
Whether you are looking to replace a cracked fender, upgrade the look of your truck, or perform a full dually conversion on a single-rear-wheel vehicle, finding the right parts is essential. This guide will walk you through everything you need to know about selecting, purchasing, and installing dually truck fenders to keep your vehicle looking and performing its best.
Understanding Dually Fender Types
Before you begin shopping, it is important to understand that not all dually fenders are created equal. The design and fitment depend heavily on the make, model, and year of your truck, as well as the specific bed length. Most dually trucks come in two primary configurations: long bed (8 feet) and short bed (6.5 feet or similar).
OEM Replacement Fenders
Original Equipment Manufacturer (OEM) fenders are designed to match the exact specifications of the fenders that originally came with your truck. These are the best choice if you want to maintain a factory-stock appearance. They are typically made from high-quality composite materials or heavy-duty plastics designed to withstand UV exposure and minor impacts.
Custom and Stretched Fenders
If you have modified your truck with larger tires or a wider axle, standard fenders might not provide enough coverage. Custom or “stretched” fenders are wider than factory versions. These are popular in the aftermarket community for owners who want a more aggressive stance or need to comply with local laws regarding tire coverage.
Conversion Fenders
Conversion fenders are specifically designed for truck owners who are transforming a single-rear-wheel (SRW) truck into a dual-rear-wheel (DRW) truck. Because an SRW bed does not have the cutouts for dual wheels, these fenders are designed to be mounted onto a standard flat-sided bed. This is often a more cost-effective solution than replacing the entire truck bed.
Choosing the Right Material
The material of your dually fender affects its durability, weight, and ease of repair. When searching for replacements, you will generally encounter three main materials.
- Fiberglass: This is the most common material for aftermarket and conversion fenders. Fiberglass is lightweight and relatively easy to repair if it sustains a crack. It provides a smooth surface that takes paint very well.
- ABS Plastic: Many modern OEM fenders are made from high-impact ABS plastic. This material is more flexible than fiberglass, meaning it can sometimes absorb a light bump without cracking. However, it can be more difficult to repair if it does break.
- Carbon Fiber: Occasionally found in high-end custom builds, carbon fiber offers extreme weight savings and a unique look, though it is significantly more expensive and less common for standard work trucks.
Key Considerations Before You Buy
Buying dually fenders is a significant investment. To ensure you get the right part the first time, keep these factors in mind during your search.
Bed Length Compatibility
One of the most common mistakes is purchasing a fender designed for a long bed when you have a short bed, or vice versa. The curvature of the fender and the placement of the fuel door cutout can vary significantly between these two bed sizes. Always verify your bed length before ordering.
Fuel Door Placement
Dually fenders usually incorporate a cutout for the fuel filler neck. Depending on the year and model of your truck, the fuel door may be located on the driver’s side or, in some custom configurations, both sides. Ensure the replacement fender has the correct cutout or provides a template for cutting one.
Hardware and Mounting Kits
Fenders rarely stay on by themselves. They require specific mounting hardware, including bolts, clips, and sometimes structural reinforcements. When purchasing a fender, check if the mounting kit is included. If you are replacing a damaged fender, your existing hardware might be reusable, but it is often better to use new, corrosion-resistant fasteners.
The Installation Process
Installing a dually fender is a project that many truck owners can handle with basic tools, though having a second set of hands is highly recommended due to the size and bulk of the parts.
Step 1: Preparation
Start by cleaning the area thoroughly. If you are replacing an old fender, remove the mounting bolts from inside the wheel well. You may need to disconnect any wiring for the fender clearance lights. Be careful not to damage the underlying bed side during removal.
Step 2: Test Fitting
Before you apply any paint or permanent adhesive, hold the new fender up to the truck. Check the alignment with the body lines and the wheel arch. If you are using conversion fenders on a standard bed, you will need to mark and drill holes according to the manufacturer’s instructions.
Step 3: Painting
Most aftermarket fenders arrive in a primer coat (usually gray or black). It is best to have the fender professionally painted to match your truck’s color code before final installation. This ensures that the underside and edges are fully protected from the elements.
Step 4: Final Mounting
Once the paint is dry, align the fender and begin securing the fasteners. Start from the center and work your way out to ensure the fender sits flush against the bed. Reconnect the clearance lights and test them to ensure they are functioning correctly.
Maintenance and Care
Once your new fenders are installed, a little maintenance will go a long way in preserving their appearance. Because dually fenders catch a lot of road debris kicked up by the rear tires, they are prone to stone chips. Consider applying a paint protection film (PPF) or a spray-on bedliner coating to the forward-facing edge of the fender. This provides a sacrificial layer that prevents the paint from chipping and the material from eroding over time.
Regularly check the mounting bolts to ensure they haven’t vibrated loose, especially if you frequently drive on gravel roads or washboard terrain. Keeping the mounting area clean of salt and mud will also prevent corrosion on the metal parts of the truck bed where the fender attaches.
Conclusion
Replacing or upgrading your dually fenders is an effective way to restore the utility and aesthetic appeal of your truck. By understanding the differences between OEM and conversion styles and choosing the right material for your needs, you can ensure a long-lasting repair. Always double-check your vehicle’s specifications before ordering to avoid fitment issues.
If you found this guide helpful, consider exploring our other articles on truck maintenance, towing safety, and DIY vehicle upgrades to keep your heavy-duty rig in top condition for years to come.