4" Radius Arm System w/Front Dirt Logic 4.0 Coilovers w/Reservoir & Rear 2.25 Shocks Kit w/4" lift
4" Radius Arm System w/Front Dirt Logic 4.0 Coilovers w/Reservoir & Rear 2.25 Shocks Kit w/4" lift
| Part Number | Item | Quantity |
|---|---|---|
| K2223DL | 4" Radius Arm System w/Front Dirt Logic 4.0 Coilovers w/Reservoir & Rear 2.25 Shocks | 1 |
Product Description
Fabtech's 4" Radius Arm system with the Dirt Logic 4.0 Coilover conversion has been built for the Ford Super Duty to handle the on and offroad demands of the truck enthusiast. This Radius Arm system is a heavy duty upgrade to the factory suspension and will provide additional strength to the vehicle.
The heart of this quality system is Fabtech's legendary tubular Radius Arms. The design of these arms comes from Fabtech's racing experience and are built with a tubular structure reinforced by dimple die side plates and heavy gusseting for rugged offroad use. They are superior in strength to the stock stamped arms. A heavy duty Track Bar relocation bracket centers the Super Duty axle under the vehicle and allows for full lock steering of 12.50 wide tires on 5" BS wheels.
The front suspension receives the finest shock upgrade on the market with the Dirt Logic 4.0 Coilover conversion. It will provide outstanding damping capacity offroad with a quality on road ride. This Coilover bolts in place of the factory coil spring without removal of the coil spring bucket. The Dirt Logic is constructed with a stainless steel body for maximum corrosion resistance. It comes with a giant 4" diameter aluminum remote reservoir that mounts horizontally above the Coilover to allow for full compression travel with oversized tires.
The rear suspension receives a 5" lift block, extended bump stop brackets and Dirt Logic 2.25 shocks for a balanced ride quality.
This 4" Radius Arm system with the Dirt Logic 4.0 Coilovers is the ultimate suspension system for Super Duty owners that want to turn heads and tackle the toughest offroad terrain.
System includes a free 5 year 60,000 mile powertrain warranty.
Each Fabtech component has been designed with specific features and benefits that create this quality suspension system. For a greater understanding of each these components, please see below.
Features
- Fabtech Replacement Radius Arms
- Fabtech Front Dirt Logic 4.0 Resi Coilovers
- Track Bar Relocation Bracket
- Sway Bar Drop Brackets
- Pitman Arm
- Rear Block & U-bolt Kit
RADIUS ARM
Tubular construction with dimple die side plate for superior strength. Arms are offset for full turning radius with 12.50 wide tires on 5" back space wheels. Adjustable alignment cams on the arms allow for an additional 1.5-2 degrees of caster adjustment.
DIRT LOGIC 4.0 CONVERSION
Simplistic super stout 1/4" thick steel brackets utilize the factory coil bucket to bolt in the big Dirt Logic 4.0 Coilover. A massive 4" diameter stainless steel body with 1.25" NitroSteel® piston rod for maximum corrosion resistance and durability for the most aggressive driving conditions. The remote aluminum reservoir dissipates heat for consistent damping when driving over extreme terrain at high speed. The ultimate of all Coilover shocks.
TRACK BAR BRACKET
1/4" thick steel bracketry re-positions the factory track bar to center the axle under the vehicle with the increased lift height. Super stout box style bracket is designed to eliminate deflection when the track bar moves through its full cycle.
DROPPED PITMAN ARM
Forged steel construction with high strength material that exceeds the factory specifications. Designed specifically for the Super Duty to work in conjunction with the factory drag link and Fabtech's extended length Track Bar for proper steering functionality.
FRONT & REAR BUMP STOP BRACKETS
Heavy duty 1/4" thick steel brackets extend the factory bump stop cushions down to eliminate over cycling of the suspension. The bracket's heavy duty construction can handle the full impact compression of the massive Super Duty.
SWAY BAR BRACKETS
1/4" thick steel drop brackets re-position the front sway bar for the increased ride height. This allows the sway bar link ends to fully cycle without binding throughout the extended travel range.
BRAKE LINE BRACKETS
Re-positions the factory brake lines down on the frame for the new travel range without having to open the brake system. Keeps factory fluid system intact.
STEERING STABILIZER BRACKETS
Retains the stock Ford heavy duty steering stabilizer with a 1/4" thick steel bracket and support brace to help reduce tire shimmy.
REAR LIFT BLOCKS
Cast iron 5" rear lift blocks provide lift without changing the ride quality of the factory rear suspension or load carrying capacity.
REAR U-BOLTS
U-Bolts designed to attach the entire rear differential to the vehicle. A critical part that demands the best quality for your vehicle.
DIRT LOGIC 2.25 SHOCKS
Constructed of a stainless steel body with NitroSteel® piston rod for maximum corrosion resistance and durability. Superior ride quality both on and offroad. Excellent damping for offroad use.
Part Numbers
| Qty | Part # | Description |
|---|---|---|
| 1 | FTS22209 | Component Box |
| 1 | FTS22310 | Rear Block Kit |
| 1 | FTS835252D | Front Dirt Logic 4.0 Resi Coilover (Driver) |
| 1 | FTS835252P | Front Dirt Logic 4.0 Resi Coilover (Passenger) |
| 2 | FTS810052 | Rear Dirt Logic 2.25 Shock |
| Year | Make | Model | Drive | Position | Lift |
| 2016 | Ford | F-350 Super Duty | 4WD | 4.0" | |
| 2015 | Ford | F-350 Super Duty | 4WD | 4.0" | |
| 2014 | Ford | F-350 Super Duty | 4WD | 4.0" | |
| 2013 | Ford | F-350 Super Duty | 4WD | 4.0" | |
| 2012 | Ford | F-350 Super Duty | 4WD | 4.0" | |
| 2011 | Ford | F-350 Super Duty | 4WD | 4.0" | |
| 2010 | Ford | F-350 Super Duty | 4WD | 4.0" | |
| 2009 | Ford | F-350 Super Duty | 4WD | 4.0" | |
| 2008 | Ford | F-350 Super Duty | 4WD | 4.0" |
FABTECH LIMITED LIFETIME WARRANTY
Fabtech Motorsports provides a Limited Lifetime Warranty to the original retail purchaser who owns the vehicle, on which the product was originally installed, for defects in workmanship and materials.
The Limited Lifetime Warranty excludes the following Fabtech items; bushings, bump stops, ball joints, tie rod ends, limiting straps, cross shafts, heim joints and driveshafts. These parts are subject to wear and are not considered defective when worn. They are warranted for 60 days from the date of purchase for defects in workmanship.
Dirt Logic and Performance Coilover take apart shocks are considered a serviceable shock with a one year warranty on leakage only. Service seal kits are available separately for future maintenance. All other shocks are covered under our Limited Lifetime Warranty.
Fabtech does not warrant any product for finish, alterations, modifications and/or installation contrary to Fabtech’s instructions. Alterations to the finish of the parts including but not limited to painting, powder coating, plating and/or welding will void all warranties. Some finish damage may occur to parts during shipping, which is considered normal and is not covered under warranty.
Shipping Info
Free Shipping on most orders to the lower 48 U.S. states. Truck freight items (over 100 lbs) and custom orders require a separate shipping quote.
- Applies to items like axles, leaf springs, and long-travel kits.
- No international shipping on freight items — only to U.S.-based freight forwarders.
- Worldwide shipping available: Canada, Europe, UAE, Australia, and most of Asia.
Contact us for an international shipping quote.
Returns & Exchanges
30-Day Return Policy — Items must be new, unused, uninstalled, and include all original hardware.
- No restocking fees for exchanges or gift card credit.
- 10% restocking fee on refunds, returns cost us real money, so the 10% helps keep the lights on.
- Installed, damaged, or dirty parts cannot be returned.
- Any returns missing hardware or miscellaneous items, the return will be denied and returned to the buyer at the buyer's expense.
Return Shipping Responsibility
CHECKOUT+ Package and Order Protection plan provides prepaid return labels for any returned packages, this fee varies by product.
- Our mistake (misboxed, wrong item, damaged): We cover the cost of return shipping.
- Buyer mistake (wrong item ordered, fitment error, changed mind): Return shipping is the buyer's responsibility - unless CHECKOUT+ Package Protection has been purchased.
- Under 50 lbs: Discounted carrier rate
- Over 50 lbs: Discounted carrier rate + $25 oversize fee
Refunds
Refunds are issued within 5–7 business days of receiving your return.
- Funds typically post to your account in 1–3 business days depending on your payment method.
- There is a 10% restocking fee on all refunds. We don’t get our original shipping, labor, or transaction fees back — so the 10% restocking fee keeps the lights on.
- You will receive an email once your refund is processed.
International Orders
- All international orders are final sale.
- Returns via freight forwarders only accepted if the product hasn’t left the U.S.
- Import taxes, duties, and other possible import-related fees are the buyer’s responsibility and not included in our shipping charges.
- We are not responsible for goods once exported outside the U.S.
Product Details
Whether you want to upgrade, add a reservoir, or find something more affordable, contact us with any questions!
View full product specifications
View warranty coverage
Free shipping within the lower 48 United States
Explore Your Options
