Truck Hardware Gatorback Denali Dually Mud Flaps - Set of 4 - Fits 2020-2026 GMC Sierra 3500HD

Part #:
GCS200F-D~GCR204R-D
Sale Price
$741.60
$824.00
Free Shipping
In Stock Ships by Monday

Additional details

    ⚠️Does NOT fit with OEM rear wheel well liners
  • Installs over OEM protector - Does NOT fit with OEM splash guards
  • Includes (2) 12" wide front flaps (1 driver/1 pass) with stainless brackets & hardware
  • Includes (2) 21" wide dually flaps (1 driver/1 pass) with brackets & hardware
  • Custom fit - No body drilling required for installation
  • Front - 8.75" tire coverage from fender to bottom of flap
  • Rear - 13.25" tire coverage from fender to bottom of flap
  • Lifetime limited warranty

Front Flap Installation Video

Step By Step Install Instructions

Rear Flap Installation Video

Step By Step Install Instructions

Gatorback Plate Finishes

Here are the different plate finishes

At a glance

Overall sentiment is strongly positive: buyers consistently describe Gatorback/SharpTruck mud flaps as premium, heavy‑duty, great-looking, and highly effective at stopping rocks/mud/snow from hitting paint, steps, and trailers. The main reservations are the high price and occasional installation/fitment or hardware/packaging issues, which are often mitigated by responsive customer service and strong warranty support.

What Customers Liked

  • Thick, heavy rubber with substantial weight plates; feels “OTR/semi-truck grade,” doesn’t flap at highway speeds, flexible in cold weather, holds up through winters, gravel roads, mud, and years of use; many repeat buyers across multiple trucks.
  • Significantly reduces rock chips, road debris, mud/salt spray on paint, rocker panels, running boards/power steps, cameras, and keeps trailers/5th wheels/RVs cleaner and protected; coverage often better than OEM or plastic splash guards.
  • Looks “sharp,” classy, and truck-specific; logo/plate options (Z71, AT4X, Ford, Ram, Duramax, flags, black/satin/gunmetal/chrome) get compliments and help the truck stand out; finishing caps appreciated.
  • Many report perfect/vehicle-specific fit with factory-hole mounting, adjustable in/out positioning, good clearance with stock tires, and compatibility with certain trims/fender flares when configured correctly.
  • Generally described as straightforward with the right tools; helpful YouTube videos; bracket kits (especially rear/dually) add stability and make alignment easier; ability to install without removing wheels on some vehicles.
  • Frequent praise for fast shipping, responsive support, quick exchanges for wrong parts, replacement parts/plates/flaps shipped rapidly, and hassle-free warranty (including tears/rips or shipping damage).
  • Replaceable plates; removable lower section on some models for off-road clearance; ability to adjust flap stick-out; some like drilling only into plastic liner (not body).

Things to Consider

  • Most common complaint; many call them expensive/overpriced (often $600–$1000+), sometimes compounded by needing separate bracket kits/plates; some say alternatives may be “good enough” for less.
  • Mixed experiences: some installs are quick, others take hours—especially rear/dually, with wheel-well liners, rock rails/steps, or limited access; right-angle drill and/or removing rear wheels often recommended; alignment can be finicky.
  • Paper instructions sometimes vague, lacking steps, inconsistent with videos, or confusing (hardware ID, left/right orientation, templates, washer placement); requests for better labeling, templates, and model-specific videos.
  • Occasional reports of holes not lining up, needing to drill/elongate slots, bend/trim brackets, trim liners/trim pieces, or create homemade brackets; some rubbing with oversized tires/offset wheels; a few cases of poor fit on specific trims/years.
  • Multiple reviewers note drilling is still required (usually into plastic liner or flap), so ‘no-drill’ feels misleading in some kits.
  • Some dislike plastic clips/nut inserts pulling out/stripping, mixed metric/SAE hardware, bolt length issues, flimsy/galvanized or plastic brackets at high price, silver hardware visible (wish black), occasional missing/mismatched hardware or parts.
  • Some flaps/plates arrived scuffed/scratched or boxes damaged; brackets loosening in transit; a few wrong items shipped or missing pieces (spacers/washers/clips), though support often resolves quickly.
  • Some note low ground clearance depending on model/height; concerns about snagging in deep snow, tall grass, or off-road obstacles; some wish flaps were longer/shorter depending on use.
  • Plate finish can streak/stain (e.g., gunmetal), color/gloss differs from expectations, logos not level in a few cases, and some wish flaps came pre-slotted/pre-drilled for easier install.
AI-generated from the text of customer reviews

Most Helpful

Rear mud flaps
5
Very good quality and easy to install!! Expensive but you get what you pay for
Dually mud flaps
5
Excellent product, fit well and easy to install, thanks!
Great looking mud flaps.
5
I was really impressed with the quality of the mud flaps. Installation was simple and they look great!

Most Recent

Rear Dooley mudflaps with a Denali logo
5
The mudflaps are nice, but don’t go by the instructions on the hardware or you will have them on backwards and upside down. The stupidest thing I ever seen is the instructions. They gotta be Chinese Japanese or Korean cause yes means no and no means yes all of them, I’ve lived it for 30 something years. It’s a shame that people charging this kind of money can get away with doing what they do, I think it’s BS
2023 Sierra 3500 Mudflaps
5
Straight out of the box you can see the quality of these mudflaps. These things are hefty. Installation with brackets was quick and easy. Overall happy with the quality and look. The only downside is the price but well worth it in my opinion.

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Elevate the look of your 2020-2026 GMC Sierra 3500 HD dually with the Truck Hardware Gatorback Denali Logo Dually Mud Flaps. This complete set of mud flaps, including both front and rear pairs, provides superior protection for your truck while showcasing the iconic Denali logo, emphasizing both luxury and ruggedness. Designed to fit your GMC Sierra perfectly, these mud flaps ensure maximum tire coverage to shield your vehicle from rocks, mud, gravel, and other road debris while maintaining a refined aesthetic.

Front Mud Flaps

The front pair of Gatorback Denali Mud Flaps is engineered to fit the GMC Sierra 3500 HD trucks flawlessly. Featuring a 304 stainless steel upper bracket, known for its excellent resistance to rust, corrosion, and harsh weather conditions, ensuring durability and a polished look that lasts with a 2" kickback, these mud flaps are designed to follow the contours of the factory protector in the wheel well, providing an additional 8.75" of tire coverage below the fender. No need to remove the OEM protector—these flaps are built to work seamlessly with it, providing optimal protection and ease of installation. Constructed from 1/2" thick virgin rubber, these flaps are reinforced by a polished 304 stainless steel plate, known for its excellent resistance to rust, corrosion, and harsh weather conditions, ensuring durability and a polished look that lasts, known for its excellent corrosion resistance and durability, ensuring long-lasting protection, which resists rust and corrosion, ensuring that your truck looks great and stays protected.

Installation is straightforward, using factory mounting points and custom-designed brackets. The set includes all necessary hardware and brackets, making it easy to secure the mud flaps without any body drilling. The mud flaps mount overtop of the factory protectors, extending down to add significant tire coverage and increased protection. The stainless steel plate measures 10 1/4" x 5", adding a sophisticated touch while protecting your truck.

Rear Mud Flaps

The rear mud flaps are tailored for the dually GMC Sierra 3500 HD models, offering exceptional coverage for dual rear wheels. Measuring 21" in width, these mud flaps deliver extensive protection against road debris, mud, and grime, keeping your truck cleaner and reducing damage to the paint and body. The polished 304 stainless steel support bracket, known for its excellent resistance to rust, corrosion, and harsh weather conditions, ensuring durability and a polished look that lastss, which offer superior rust resistance and long-term durability add to the rugged yet refined appearance, while the officially licensed Denali logo plate conveys the luxury that the Denali trim level represents.

The virgin rubber construction ensures that these mud flaps are resilient and tough, able to handle even the most challenging road conditions. They are also designed to minimize movement, or "sail," at higher speeds, ensuring they stay securely in place for optimal protection. No drilling into the truck's body is required, and each rear flap comes with custom-fit brackets and all the hardware necessary for a secure and straightforward fit.

Heavy-Duty Design for Lasting Performance

The Gatorback Denali Dually Mud Flaps are crafted to provide premium protection while adding a touch of elegance to your truck. Constructed with virgin rubber and polished support brackets, which provide superior strength and resistance to environmental factors, ensuring long-lasting performance and a refined appearance, these mud flaps are built to endure harsh road conditions while enhancing the luxurious look of your Denali. The officially licensed Denali logo plate serves as a statement of both quality and prestige, highlighting your pride in owning a high-end GMC truck.

Installation

Installing these mud flaps is a simple process. The set utilizes factory screws and existing mounting points, ensuring compatibility with your truck's features. Custom-fit brackets and all necessary hardware are included for a seamless installation experience. Each flap takes approximately 15 minutes to install, making it easy to fit them at home with standard tools.

Key Features

  • Denali Logo Plate: Features a polished plate with the officially licensed Denali logo, adding a sleek and upscale touch to your truck. The logo represents the high-end luxury of the Denali trim, ensuring that your truck stands out with a bold, distinguished look., adding a sleek and upscale touch to your truck.
  • Enhanced Tire Coverage: Provides 8.75" of front tire coverage and 21" of rear tire coverage, effectively shielding your truck from road debris, mud, and grime, ideal for dual rear wheel configurations.
  • Heavy-Duty Virgin Rubber Construction: Made from 1/2" thick virgin rubber to endure challenging road conditions, reducing wear and tear on your vehicle and ensuring long-lasting performance.
  • Effortless, No-Drill Installation: Uses factory screws and includes custom-fit brackets for a secure and straightforward installation, delivering a premium, hassle-free experience.

Key Terms to Know

  • 304 Stainless Steel: A high-quality stainless steel known for its excellent resistance to rust, corrosion, and harsh weather conditions. It is ideal for automotive applications where exposure to the elements is common, ensuring long-lasting durability and a polished finish.
  • OEM (Original Equipment Manufacturer): Refers to parts made by the vehicle manufacturer. These mud flaps are designed to work with OEM mud protectors for an ideal fit.
  • Sail: The movement of mud flaps due to wind or speed, potentially reducing their effectiveness. The weight and design of these flaps help to minimize sail.
  • Virgin Rubber: Rubber that has not been recycled or reclaimed, ensuring superior durability and flexibility compared to recycled rubber.

Warranty

Truck Hardware Gatorback Denali Dually Mud Flaps are backed by a limited lifetime warranty. This warranty covers the rubber portion against tear-offs for the lifetime of the product for the original owner. The warranty provides peace of mind, offering a replacement if the rubber flaps come off due to normal wear and tear. However, it does not cover damage resulting from abuse or regular wear on brackets, plates, or mounting hardware.

Product Care & Maintenance

  • 304 Stainless Steel: To maintain the polished finish of the 304 stainless steel brackets and plates, clean them regularly with a soft cloth and a mild detergent cleaner. Avoid abrasive materials or harsh chemicals that could scratch or damage the surface. Rinse thoroughly with clean water and dry with a soft cloth to maintain the polished look.
  • Virgin Rubber: Clean the rubber portion using a mild soap and water solution. Avoid harsh chemicals or petroleum-based cleaners, as these can degrade the rubber over time. Rinse thoroughly and allow the mud flaps to air dry for the best results.

What's Included

  • Front Pair of Gatorback Denali Mud Flaps (Driver and Passenger Side)
  • Rear Pair of Gatorback Denali Mud Flaps (Driver and Passenger Side)
  • Installation Hardware and Mounting Brackets

For GMC Sierra owners seeking the ultimate blend of rugged protection and luxury, the Truck Hardware Gatorback Denali Logo Dually Mud Flaps are an excellent choice. With superior tire coverage, hassle-free installation, and a premium construction, these mud flaps are designed to protect your truck from road debris while showcasing the distinctive Denali logo. Choose Gatorback Denali Dually Mud Flaps for long-lasting performance and a bold, refined appearance that reflects the quality of your GMC Denali.

Other helpful topics related to the gatorback mud flaps

BrandGatorback by Truck Hardware
Length24 inch(es)
Width21 inch(es)
Height.5 inch(es)
Weight35 lb(s)

  • 2026 GMC Sierra 3500 HD
  • 2025 GMC Sierra 3500 HD
  • 2024 GMC Sierra 3500 HD
  • 2023 GMC Sierra 3500 HD
  • 2022 GMC Sierra 3500 HD
  • 2021 GMC Sierra 3500 HD
  • 2020 GMC Sierra 3500 HD

WARNING: Some products may contain chemicals such as DEHP, which can cause cancer, birth defects or other reproductive harm. For more info go to www.p65warnings.ca.gov