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

Part #:
GCN205R-D
Sale Price
$560.70
$623.00
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 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
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