AEV’s FXL is a coordinated conversion for 2026 Ford F-250 and F-350 4WD trucks, engineered around 40-inch tires rather than a standalone tire-and-lift installation. Its documented package pairs 40×13.50R18 BFGoodrich HD-Terrain T/A KT tires with AEV wheels, a four-inch suspension, revised bodywork and bumpers, and electronic calibration updates. The conversion adds substantial weight, reducing payload and maximum trailer weight, so check the specific truck’s ratings before buying or loading it.
What is included in the AEV FXL package?
AEV describes the FXL as an integrated system. Its listed components include a stamped-steel front bumper, high-clearance rear bumper, HighMark fender flares, four-inch DualSport XP suspension with AEV-tuned Bilstein shocks, 18-inch Katmai DualSport wheels, 40-inch BFGoodrich HD-Terrain tires, graphics, AEV branding, and a serialized build plaque. MotorTrend reports that the suspension uses taller progressive-rate front springs, rear lift blocks, and relocated Panhard rods and other links, along with electronic calibration updates intended to keep safety and driver-assistance systems functioning.
The specified tire is the BFGoodrich HD-Terrain T/A KT in 40×13.50R18. AEV’s 18×10 Katmai DualSport wheel has an 8×170 bolt pattern and -13mm offset, according to MotorTrend’s January 2026 first look. It is beadlock-capable; a beadlock setup requires replacing the standard protection ring with a beadlock ring.
How does the FXL make room for 40-inch tires?
Fitting a 40-inch tire involves more than choosing a lift height: the tire needs clearance around the fenders, bumpers, and chassis as the truck steers and the suspension moves. MotorTrend describes enlarged, metal-finished fender openings, HighMark flares, and front and rear bumpers shaped to preserve tire clearance. The stamped-steel front bumper is winch-capable; MotorTrend reported capacity for a winch rated up to 20,000 pounds. That is a reported bumper capacity, not a guarantee for every winch installation or recovery setup.
#1 Best Overall
- LEGENDARY TOUGHNESS, MADE TOUGHER: The next evolution of all-terrain tires is here. The BFGoodrich All-Terrain T/A KO3 tire raises the bar in toughness and durability. Again.
- ENGINEERED TO ENDURE: We engineered the BFGoodrich All-Terrain T/A KO3 tire with a new tread pattern and new all-terrain tread compound to provide durability and longevity, even on gravel.
- BUILT TO OVERCOME: Our CoreGard Technology, developed for racing in Baja, gives the BFGoodrich All-Terrain T/A KO3 tire excellent sidewall toughness. And the Advanced Deflection Design helps prevent sticks and stones from snagging and splitting the sidewall.
- DESIGNED TO DO IT ALL: Even in the worst of conditions, the BFGoodrich All-Terrain T/A KO3 tire is made to grip. The serrated shoulder design and mud-phobic bars improve upon KO2 tire’s legendary mud and snow traction.
- THE BFG GUARANTEE: The BFGoodrich All-Terrain T/A KO3 tire is backed by a 50,000-mile manufacturer's treadwear limited warranty and a 6-year standard limited warranty
The available reporting covers the 2026 F-250 and F-350 FXL. It does not establish that the same setup fits every model year, trim, axle, or Super Duty unchanged. Do not treat the 40-inch tires as a universal bolt-on fitment.
AEV FXL specifications and trade-offs
| Item | Documented FXL details |
|---|---|
| Vehicles covered | 2026 Ford F-250 and F-350 4WD, as covered by the cited reporting |
| Tires | BFGoodrich HD-Terrain T/A KT, 40×13.50R18 |
| Wheels | 18×10 AEV Katmai DualSport; 8×170 bolt pattern; -13mm offset |
| Suspension | Four-inch DualSport XP suspension with AEV-tuned Bilstein shocks |
| Added weight | MotorTrend estimates roughly 1,000 pounds of added parts |
| Payload and towing | Payload and maximum trailer weight decrease; use the upfitted truck’s own labels and ratings |
MotorTrend reported that the test vehicle’s tire placard allowed 2,629 pounds of occupants and cargo and that its compliance tag listed an 11,000-pound GVWR, with 5,990-pound front and 6,340-pound rear gross axle weight ratings. These figures describe that specific test vehicle, not every FXL. The outlet also cautions that the added chassis height can complicate hitch geometry.
FXL price, purchase route, and warranty
MotorTrend reported in July 2026 that the FXL package started at $25,999 above the price of a 2026 F-250 or F-350 4WD. Its example combined the package with a base F-250 XL 4WD, eight-foot bed, and 6.8-liter gasoline V-8 for a reported $77,559 starting total. These are dated reported prices, not guaranteed current quotes. Confirm current price, eligible configurations, availability, and warranty terms with AEV or an authorized dealer.
Rank #2
- Designed for use on light trucks and SUVs
- Lower void ratio at center and open grooves at shoulder for offroad grip
- Stone ejectors built into tread grooves promote self-cleaning for consistent traction and to protect the casing from damage
- 3-ply polyester casing and high turnup construction increase load carrying capacity while also protecting the tire from damage
- The arched segmented stone ejectors extend from shoulder to shoulder of the tread design. They prevent stones and debris from lodging between the tread blocks, while facilitating continuous, maximum traction, and performance.
AEV said individual components would be offered through its global dealer network beginning in Q2 2026. MotorTrend reported that full conversions would be assembled at AEV’s Wixom, Michigan facility and delivered through authorized dealers. Its August 2026 test says AEV factory or approved dealer upfits are warranted for three years or 36,000 miles; confirm how that applies to the specific truck and installation.
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| Feature | AEV FXL | AEV FX370 |
|---|---|---|
| Tires | 40-inch BFGoodrich HD-Terrain T/A KT | 37-inch BFGoodrich All-Terrain KO3 |
| Wheels | 18-inch Katmai DualSport | AEV Salta XD |
| Suspension | Four-inch DualSport XP | Four-inch DualSport RT |
| Reported package price | $25,999 | $19,999 |
| Reported difference | $6,000 more than FX370, before vehicle cost | Reported as the more affordable, more livable option |
The comparison and prices come from MotorTrend reporting in July 2026. Choose based on the tire size, package contents, current quote, truck configuration, and intended use—not price alone.
Fitment and safety checks before choosing 40-inch tires
Ford’s Super Duty owner’s manual says: “Only use replacement tires and wheels that are the same size, as those originally provided for your vehicle.” Ford warns that unrecommended tires or wheels may affect safety and performance and increase the risk of loss of control, rollover, injury, or death. The manual directs owners to the tire label on the driver-side door frame or edge of the driver door, or to an authorized dealer for additional options. For an AEV conversion, follow the upfitted truck’s placard and AEV or dealer instructions.
Rank #3
- Product Overview: The Venom Power Swampthing A/T Xtreme Dirt are 37X13.50R18 128Q F 12 Ply Rated All Terrain Tires Manufactured For Light Trucks
- Driving Conditions: All Season Traction, 55,000 miles Treadwear
- Styling and Construction: Four Black Sidewall, Radial Construction, 18 Inch Tires
- Load Index and Speed Rating: Load Index 128 Supports up to 3968 lbs Per Tire and Speed Rating Q Certified to 99 mph
- Additional Note: Tires Only - Rims/Wheels Not Included
- Confirm that the exact truck year, model, trim, drivetrain, and configuration are supported by the FXL conversion.
- Check the upfitted truck’s tire placard, GVWR, axle ratings, payload, and trailer limits; do not rely on another truck’s test figures.
- Ask AEV or an authorized dealer to confirm current pricing, availability, installation route, and warranty for that truck.
- Plan for the conversion’s added weight and altered hitch geometry before towing or carrying a load.
MotorTrend reported that the FXL could be aired down to 20 psi off-road without beadlock rings. Do not treat that as a general road pressure or as suitable for every load, temperature, tire, wheel, or vehicle. Its August 2026 test also reported no onboard compressor option and no 40-inch spare provision at that time; a tailgate-mounted spare solution was described as in development. These details may change, so verify current equipment and spare-tire options.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
What size tires are on the AEV FXL?
The documented FXL tire is a BFGoodrich HD-Terrain T/A KT, size 40×13.50R18, paired with an 18-inch AEV Katmai DualSport wheel.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCan you put 40-inch tires on any Ford Super Duty?
The cited reporting covers the 2026 F-250 and F-350 FXL conversion. It does not establish universal fitment across all Super Duty years, trims, axles, or configurations. Check the exact vehicle with AEV or an authorized dealer.
Rank #4
- Asymmetric tread pattern is optimized for reduced noise, off-road traction, and on-road handling
- Extra Large Four-Pitch SideBiters for enhanced off-road traction
- Powerply XD adds heavier denier cord to the angled third ply, providing better puncture resistance, quicker steering response, and greater stability
- Stone Ejector Ribs prevent gravel from being wedged into tread grooves
- T4 Silica-Reinforced Compound is designed to provide excellent wet handling/braking performance, cut and chip resistance, and lasting treadlife
How much does the AEV FXL cost?
MotorTrend reported a $25,999 FXL package price above the cost of a 2026 F-250 or F-350 4WD in July 2026. Prices and availability can change; request a current quote for the specific configuration.
Does the FXL reduce payload and towing capacity?
Yes. MotorTrend estimated roughly 1,000 pounds of added parts and said payload and maximum trailer weight decrease accordingly. The actual limits depend on the upfitted truck, so use its labels and ratings.
What is the AEV FX370?
The FX370 is AEV’s documented 37-inch alternative, using BFGoodrich All-Terrain KO3 tires, Salta XD wheels, and a four-inch DualSport RT suspension. MotorTrend reported a July 2026 package price of $19,999 and characterized it as more livable and affordable than the FXL.
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