Truck Hardware Gatorback Rubber Mud Flaps - Set of 4 - Fits 2023-2026 GMC Sierra 1500 AT4X

Part #:
GCN211K-BK
Sale Price
$544.50
$605.00
Free Shipping
In Stock Ships by Monday

Additional details

    ⚠️Fits AT4X & AT4X AEV models only
  • Includes (4) 12.5" wide mud flaps, brackets & hardware
  • Removable heavy duty premium rubber flaps
  • Front tire coverage - 8.75" below fender
  • Rear tire coverage - 8.75" below fender
  • 1 year limited warranty

Installation Video

Step by Step 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
Perfect fit!
5
Just got a 2026 AT4X. Couldn’t find aftermarket mud flaps. Only could get from gmc. Great price, fit perfectly and built heavy duty.
2024 AT4X
5
Works great easy install

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This Gatorback Offset Mud Flap set for the GMC Sierra 1500 AT4X (AEV) is designed to fit perfectly. The flaps are 12.5" of heavy duty rubber and are attached to a custom fit bracket. The brackets are made from nylon/fiberglass material that gives them the durability you need. The brackets will not fade or chip and have the holes that line up with the factory fasteners already in them for a quick, simple install. The heavy duty rubber ensures that there will not be any debris that gets passed these flaps. These install inside the wheel well and have a 5/8" offset for extra tire clearance and come with all the hardware needed. An added feature of these flaps is the rubber portion is removable from the bracket via a built in channel to allow the flap to slide in and out for easy removal. This gives you the options for extra ground clearance if needed. Giving you the options for extra ground clearance if needed. When you remove the factory mud guard there will be a small hole in the fender that the fender plugs will cover. That is why the color of your truck is needed. The Truck Hardware Gatorback series mud flaps are the industries highest quality heavy duty mud guards! The rugged design and quality finish of these mud flaps make the perfect compliment to your truck. Featuring a 1/2" thick rubber flap, these mud flaps are sure to impress while they protect your investment.

Installation is made simple featuring no body drilling to install using factory exisiting screws. Installation takes about 15 mins per flap and you can use tools you have at home. The Gatorbacks install the inside of the wheel well and feature a 5/8" Offset so they work with step bars, power boards or side steps. The mudflaps also feature a lifetime warranty on the rubber portion of the flap. If the flap comes off the truck or is damaged to due to normal wear and tear, let us know and we will send you a replacement piece of rubber at no charge.

Manufacturer Warranty-

Gatorback mudflaps are backed by a Limited lifetime warranty. This warranty covers rubber replacement (ex- tear offs) for the lifetime of the product to the original owner. It does not cover damage caused by abuse, or regular wear and tear on brackets, plates, or mounting hardware. On the nylon brackets a 1 year warranty is included for manufacturing defects. Damage by abuse, or regular wear and tear is not covered. On the nylon brackets a 1 year warranty is included for manufacturing defects. Damage by abuse, or regular wear and tear is not covered.

Other helpful topics related to the gatorback mud flaps

Brand Gatorback by Truck Hardware
Length 23 inch(es)
Width 12 inch(es)
Height .5 inch(es)
Weight 19 lb(s)
UPC 667511048718

  • 2026 GMC Sierra 1500
  • 2025 GMC Sierra 1500
  • 2024 GMC Sierra 1500
  • 2023 GMC Sierra 1500

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