Skip to the beginning of the images gallery

Fabtech K2131DL 6″ Radius Arm System with Dirt Logic Shocks

2008-2016 Ford F-350 4WD 2011-2013 Ford F-450 4WD

Radius Arm Lift System

Brand : Fabtech
SKU : BKBNK2131DL
Part Number : K2131DL

4.9257075471698 848 5

98.514150943396%

4.9/5 out of 848 Company Reviews. Rating:

Add Your Review

$3,614.73

Your discount may still be available. Contact us in Live Chat

Lowest Prices
Price match guarantee
In-House Experts
We know our products
Factory Authorized
Install Center
Guaranteed Fitment
Always the correct part
International Shipping?
Get a Quote

Talk to a Specialist Now

Click here for live chat

Product Details

The 2008–2016 Ford F350 4WD and 2011–2013 Ford F450 4WD (8 lug) can be equipped with our advanced Radius Arm System, designed to improve suspension strength, steering stability, and overall ride performance.

Our patented radius arms feature a fully tubular structure reinforced with dimple-die side plates for exceptional durability. An adjustable alignment cam at the axle allows precise caster adjustment to maintain proper steering control after lifting.

The front spring lift is achieved using Fabtech coil springs, providing improved ride quality and consistent suspension operation. The system also includes a track bar relocation bracket, Pitman arm, sway bar drops, and additional components to maintain correct steering and suspension geometry.

Rear lift is provided by a block and U-bolt kit, offering reliable height increase, a stable stance, and dependable load-carrying capability.

Our patented Radius Arms feature a full tubular structure strengthened by dimple die side plates with an adjustable alignment cam at the axle to allow caster adjustment. Front spring lift options includes 6 replacement

Radius Arm Lift System; w/DLSS Shocks; 6 in. Lift;;

Unsurpassed Strength And Performance
Patent Pending Radius Arms
Fully Tubular Structure
Dimple Die Side Plates
Adjustable Alignment Cam Allows Caster Adjustment

This Order Qualifies For FREE Bad Ass Swag

Tshirt

Hat

Beanie Cap

Nascar #2 Creed Championship Truck

In-stock 3 In-stock / 6 Sold ships same day or next day

Fitment

Years	Make	Model	Drive
2008-2016	Ford	F-350	4WD
2011-2013	Ford	F-450	4WD

Features

Fabtech replacement radius arms for increased strength and improved suspension geometry
Fabtech front coil springs providing lift and enhanced ride performance
Track bar relocation bracket ensuring proper axle alignment after lifting
Sway bar drop brackets maintaining correct sway bar positioning and functionality
Pitman arm for corrected steering angles and reduced bump steer
Rear block and U-bolt kit delivering dependable rear lift and a stable stance

Components

1 × FTS22024BK – Coil Box Kit
1 × FTS22139 – Component Box
1 × FTS22103 – Rear Block Kit
2 × FTS810382 – Front Dirt Logic 2.25 Non Resi
2 × FTS810052 – Rear Dirt Logic 2.25 Non Resi

Dirt Logic 2.25 Shock

Dirt Logic 2.25’s are designed to replace factory shocks with a larger, more robust configuration. The increased 2.25 size distinguishes them from other replacement take-apart shocks, delivering a superior ride both on and off road. Each shock is pretuned specifically for its matching Fabtech suspension system, accounting for larger tire sizes and ensuring the finest all-around damping performance.

2.25″ OD Stainless Steel Body
2.0″ OD Billet Aluminum Piston
7/8″ NitroSteel® Black Piston Rod
Polyurethane Mounting Ends

Quick Specs

Tire Size: 315/70R17 — Wheel Size: 17×8 with 4 1/2" backspacing (minor trimming required)
Tire Size: 325/65R18 — Wheel Size: 18×9.5 with 4 3/4" backspacing (minor trimming required)
Tire Size: 35/12.50R20 — Wheel Size: 20×9 with 5" backspacing (minor trimming required)