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Truck Hardware Gatorback Denali Dually Mud Flaps - Rear Pair - Fits 2020-2026 GMC Sierra 3500HD

Part #:
GCN205R-D
Sale Price
$534.40
$668.00
Free Shipping
ON ORDER — Expected to Ship in 10-14 Days

Additional details

    ⚠️Does NOT fit with rear dually wheel well liners
  • Includes (2) 21" wide dually flaps (1 driver/1 pass) & brackets
  • Custom fit - No body drilling required for installation
  • Rear - 13.25" tire coverage from fender to bottom of flap
  • Lifetime limited warranty

Gatorback Plate Finishes

Here are the different plate finishines

At a glance

Overall sentiment is overwhelmingly positive: customers consistently describe Gatorback/SharpTruck mud flaps as premium, heavy-duty, great-looking products that provide excellent protection, with standout customer service and warranty support; the main negatives are high price and occasional installation/hardware/fitment frustrations.

What Customers Liked

  • Thick, heavy rubber with a substantial feel; durable, flexible in cold/snow/ice; doesn’t “sail” at highway speeds; plates/weights feel robust and can be replaced/swapped.
  • Significantly reduces rock chips, mud/salt spray, and slush on rocker panels, running boards/power steps, bumpers, trailers/RVs; many note cleaner sides and less debris noise on gravel roads.
  • Vehicle-specific fit often described as ‘like a glove’/OEM; finishes (chrome, gunmetal, black plates) and logo plates (Z71/AT4X/FX4/Ram/Ford/Chevy, flags, etc.) ‘make the truck pop’ and draw compliments.
  • Many report straightforward installs, especially after the first flap; helpful YouTube videos; slotted holes help leveling; adjustable stick-out; removable lower section appreciated for off-roading/clearance.
  • Fast shipping is frequently praised; responsive support for exchanges/mis-shipments/damaged parts; hassle-free warranty replacements (torn/ripped flaps or scratched plates) often sent quickly.

Things to Consider

  • Most common complaint: ‘pricey/overpriced’ (often $600–$1000 with brackets/plates). Some feel brackets/plates should be included at that price.
  • Installs can be time-consuming or awkward (especially rears/dually setups), sometimes requiring wheel removal, right-angle drill, extra hands, drilling into plastic liners, trimming liners/trim pieces, or drilling/slot-cutting templates.
  • Paper instructions sometimes lacking, confusing, or mismatched vs video; hardware bags not well-separated/labeled; left/right not always marked; templates/printer scaling issues; ‘no-drill’ marketing criticized when drilling plastic is required.
  • Occasional reports of cheap/fragile fasteners, plastic clips/nut inserts pulling out/stripping, mixed metric/SAE heads, silver hardware being visually noticeable, bracket thickness/material concerns (plastic/galvanized vs stainless), and clamp-on brackets potentially rubbing paint (suggest PPF/tape).
  • Some vehicles need hole elongation, bracket bending, or ‘gerry-rigging’; occasional rubbing with oversized tires/offset wheels; a few reports of mis-shipped parts (two rears), wrong plates/colors, missing washers/spacers/clips/screws, or shipping scuffs/scratches/damaged boxes.
AI-generated from the text of customer reviews
Totally satisfied
5
My first set of Gatorback mud flaps but they will be on all trucks from here on out!

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Premium Protection with Denali Style

Upgrade your GMC Sierra 3500 HD dually with the Truck Hardware Gatorback "Denali" Logo Dually Mud Flaps - Set. Featuring the iconic Denali logo on a 304 stainless steel plate, these premium mud flaps provide unparalleled protection for your truck's rear wheels while adding a touch of exclusive style. Designed to withstand the toughest road conditions, these mud flaps are ideal for truck owners who want both functionality and aesthetics.

Durable Construction for Long-Lasting Performance

The Gatorback "Denali" Logo Dually Mud Flap Set features 21" wide and 1/2" thick heavy-duty rubber, offering exceptional defense against rocks, mud, gravel, and other road debris. Each flap is reinforced with a high-quality 304 stainless steel plate, which is polished to perfection and resists rust and corrosion, ensuring the mud flaps retain their great look over time. The custom-fit rear support brackets are constructed from a durable nylon and fiberglass composite, which will not fade or chip, ensuring your mud flaps look as great as they function for years to come.

Effortless Installation

Installing the Gatorback mud flaps is simple and requires no body drilling. The custom-fit rear support brackets and hardware use existing factory mounting points, making installation quick and hassle-free. With basic tools and the provided instructions, you can have your mud flaps installed in no time. The flaps install flush with the wheel well and fit seamlessly over the OEM splash guards, maintaining your truck's factory appearance.

Tire Coverage

  • Rear Tire Coverage: Offers 13.25" of tire coverage from the bottom of the fender to the bottom of the flap, providing comprehensive protection against road debris.

Key Features

  • Heavy-Duty Rubber Construction: 21" wide flaps offer excellent coverage and protection for your truck's rear wheels.
  • Official Denali Logo on Stainless Steel Plate: The iconic Denali logo is die-stamped into a 304 stainless steel plate, adding a premium look to your truck.
  • No-Drill Installation: The custom-fit brackets and hardware use factory mounting points, eliminating the need for additional drilling.
  • Heavy Weight to Prevent Sailing: The substantial weight of the mud flaps ensures they stay securely in place, even at highway speeds.

Product Care & Maintenance

  • Rubber Flaps: Clean with mild soap and water to maintain their appearance. Avoid using abrasive cleaners that could damage the rubber.
  • Stainless Steel Plate: Use a non-abrasive cleaner to maintain the polished finish of the stainless steel plate.

What's Included

  • Two 21" wide Gatorback "Denali" Logo Dually Mud Flaps for the rear.
  • Custom rear support brackets and all necessary mounting hardware.

Warranty Information

Gatorback Mud Flaps are backed by a limited lifetime warranty. This warranty covers defects in the rubber portion of the mud flaps for the original owner, including replacement for damages caused by normal wear and tear. The warranty does not cover damage resulting from misuse, abuse, or improper installation. The nylon support brackets come with a 1-year warranty against manufacturing defects.

Terms

  • 304 Stainless Steel: A type of stainless steel known for its excellent corrosion resistance, strength, and polished appearance.
  • No-Drill Installation: A method of installation that does not require additional holes to be drilled, using existing factory mounting points instead.
  • Heavy-Duty Rubber: A resilient rubber material designed to withstand harsh road conditions, protecting your vehicle from debris.

Protect your GMC Sierra 3500 HD dually with the rugged and stylish Truck Hardware Gatorback "Denali" Logo Dually Mud Flaps. Built to withstand the harshest road conditions, these mud flaps combine heavy-duty construction with the exclusive Denali style, keeping your truck protected and looking its best. Trust Gatorback for unmatched quality, performance, and style.

Brand Gatorback by Truck Hardware
Length 24 inch(es)
Width 21 inch(es)
Height .5 inch(es)
Weight 24 lb(s)
UPC 667511041566

  • 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